AGREEMENT AND PLAN OF REORGANIZATION

                                 BY AND BETWEEN

                        AMERICAN CENTURY INVESTMENT TRUST

                                       and

                       AMERICAN CENTURY MUTUAL FUNDS, INC.



                         DATED ------------------, 1998


                                TABLE OF CONTENTS



1.       Transfer of Assets of Cash Reserve.....................................
2.       Liquidating Distribution and Termination of Cash Reserve...............
3.       Valuation Time.........................................................
4.       Certain Representations, Warranties and Agreements of ACMF.............
5.       Certain Representations, Warranties and Agreements of ACIT.............
6.       Shareholder Action on Behalf of Cash Reserve...........................
7.       Registration Statement and Proxy Solicitation Materials................
8.       Effective Time of the Reorganization...................................
9.       ACIT's Conditions......................................................
10.      ACMF's Conditions......................................................
11.      Tax Documents..........................................................
12.      Further Assurances.....................................................
13.      Termination of Representations and Warranties..........................
14.      Termination of Agreement...............................................
15.      Amendment and Waiver...................................................
16.      Governing Law..........................................................
17.      Successors and Assigns.................................................
18.      Beneficiaries..........................................................
19.      ACIT Liability.........................................................
20.      ACMF Liability.........................................................
21.      Notices................................................................
22.      Expenses...............................................................
23.      Entire Agreement.......................................................
24.      Counterparts...........................................................

                      AGREEMENT AND PLAN OF REORGANIZATION

         AGREEMENT AND PLAN OF REORGANIZATION made as of ----------------,  1998
by and between American Century Investment Trust, a Massachusetts business trust
("ACIT"),  and American  Century  Mutual  Funds,  Inc.,  a Maryland  corporation
("ACMF").

         WHEREAS,  the parties desire that  substantially  all of the assets and
liabilities  of  the  Cash  Reserve   portfolio  of  ACMF  ("Cash  Reserve")  be
transferred to, and be acquired and assumed by, the Prime Money Market portfolio
of ACIT  ("Prime")  in exchange  for shares of Prime which shall  thereafter  be
distributed  by ACMF to the holders of shares of Cash Reserve,  all as described
in this Agreement (the "Reorganization");

         WHEREAS, the parties intend that the transfer of assets,  assumption of
liabilities and  distribution of shares in Cash Reserve be treated as a tax-free
reorganization under Section  368(a)(1)(C),  368(a)(1)(D) or 368(a)(1)(F) of the
Internal Revenue Code of 1986, as amended (the "Code"); and

         WHEREAS,  the parties intend that in connection with the Reorganization
Cash  Reserve  shall  be  terminated  and  de-registered  as  described  in this
Agreement.

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
hereinafter  set forth and  subject  to the terms  and  conditions  hereof,  and
intending to be legally bound hereby, ACMF and ACIT agree as follows:

1.       TRANSFER OF ASSETS OF CASH RESERVE.

         1.1.     At the  Effective  Time (as  defined in Section 8), ACMF shall
                  transfer and convey to ACIT, on behalf of Prime,  all property
                  of every description,  and all interests,  rights,  privileges
                  and  powers  of Cash  Reserve  other  than  cash in an  amount
                  necessary to pay any unpaid  dividends  and  distributions  as
                  provided  in  Section  4.7 (such  assets,  the  "Cash  Reserve
                  Assets").  Simultaneously,  ACIT  shall,  on  behalf of Prime,
                  accept   the  Cash   Reserve   Assets  and  assume  all  known
                  liabilities,   whether   accrued,   absolute,   contingent  or
                  otherwise,  of Cash Reserve  reflected in the  calculation  of
                  Cash   Reserve's   net  asset   value   (the   "Cash   Reserve
                  Liabilities").  As a result,  at and after the Effective Time:
                  (i) all assets of Cash Reserve  shall become and be the assets
                  of  Prime;  and (ii) all  known  liabilities  of Cash  Reserve
                  reflected as such in the  calculation  of Cash  Reserve's  net
                  asset  value  shall  attach  to  Prime  as  aforesaid  and may
                  thenceforth be enforced  against Prime to the extent as if the
                  same had been incurred by it. Without  limiting the generality
                  of the  foregoing,  the Cash Reserve  Assets shall include all
                  property  and  assets  of any  nature  whatsoever,  including,
                  without  limitation,  all cash, cash equivalents,  securities,
                  other investments,  claims and receivables (including dividend
                  and  interest  receivables)  owned  by Cash  Reserve,  and any
                  deferred  or  prepaid  expenses  shown  as an  asset  on  Cash
                  Reserve's  books at the  Effective  Time,  and all good  will,
                  other intangible  property and books and records  belonging to
                  Cash  Reserve.  Recourse  by any person  for the Cash  Reserve
                  Liabilities assumed by Prime shall, at and after the Effective
                  Time, be limited to Prime.

         1.2.     In exchange for the  transfer of the Cash  Reserve  Assets and
                  the  assumption  of the Cash Reserve  Liabilities,  ACIT shall
                  simultaneously  issue at the Effective  Time to Cash Reserve a
                  number of full and  fractional  shares  (to the third  decimal
                  place) of Prime,  all  determined  and adjusted as provided in
                  this  Agreement.  The number of shares of Prime so issued will
                  have an  aggregate  net asset  value equal to the value of the
                  Cash  Reserve  Assets that are  represented  by shares of Cash
                  Reserve,  the holders of which shall receive  shares of Prime,
                  all determined and adjusted as provided in this Agreement.

         1.3.     The net asset  values  of shares of Prime and of Cash  Reserve
                  shall be determined  as of the  Valuation  Time, as defined in
                  Section 3.

         1.4.     The net asset  value of shares of Prime  shall be  computed in
                  the manner set forth in Prime's then-current  prospectus under
                  the Securities  Act of 1933, as amended (the "1933 Act").  The
                  net asset value of the Cash Reserve  Assets to be  transferred
                  by ACMF  shall be  computed  by ACMF and shall be  subject  to
                  adjustment by the amount,  if any, agreed to by ACIT and ACMF.
                  In determining the value of the securities transferred by Cash
                  Reserve to Prime,  each security shall be priced in accordance
                  with the policies and  procedures  of ACIT as described in its
                  then  current   prospectus   and   statement   of   additional
                  information and adopted by ACIT's Board of Trustees, which are
                  and shall be  consistent  with the  policies now in effect for
                  ACMF.  Price  quotations  and  the  security   characteristics
                  relating to establishing  such quotations  shall be determined
                  by ACIT,  provided that such determination shall be subject to
                  the approval of ACMF.

2.       LIQUIDATING DISTRIBUTION AND TERMINATION OF CASH RESERVE.

         Immediately  after the Effective Time, Cash Reserve shall distribute in
         complete  liquidation  pro rata to the record  holders of its shares at
         the  Effective  Time the shares of Prime to be  received  by the record
         holders of Cash Reserve.  In addition,  each  shareholder  of record of
         Cash  Reserve  shall have the right to receive any unpaid  dividends or
         other  distributions  that were declared before the Effective Time with
         respect to the shares of Cash Reserve that are held by the  shareholder
         at the Effective Time. In accordance with instructions it receives from
         ACMF,  ACIT shall record on its books the  ownership of shares of Prime
         by the record holders of shares of Cash Reserve.  All of the issued and
         outstanding  shares of Cash  Reserve  shall be redeemed and canceled on
         the books of ACMF at the Effective Time and shall thereafter  represent
         only the right to  receive  the  shares of  Prime,  and Cash  Reserve's
         transfer  books  shall be closed  permanently.  As soon as  practicable
         after  the  Effective  Time,  ACMF  shall  take  all  steps as shall be
         necessary  and proper to effect the  dissolution  of Cash Reserve under
         federal and state law. After the Effective Time, ACMF shall not conduct
         any business  with respect to Cash Reserve  except in  connection  with
         Cash Reserve's liquidation and dissolution.

3.       VALUATION TIME.

         Subject  to  Section   1.4   hereof,   the   Valuation   Time  for  the
         Reorganization  shall be as of 4:00 p.m.  Eastern Time, on such date as
         may be agreed by the duly authorized officers of both parties hereto.

4.       CERTAIN REPRESENTATIONS, WARRANTIES AND AGREEMENTS OF ACMF.

         ACMF, on behalf of itself and Cash Reserve, represents and warrants to,
         and agrees with, ACIT as follows:

         4.1.     ACMF is a Maryland  corporation  duly created  pursuant to its
                  Articles  of  Incorporation  for the  purpose  of  acting as a
                  management  investment  company  under  the  1940  Act  and is
                  validly  existing  under the laws of, and duly  authorized  to
                  transact  business in, the State of Maryland.  Cash Reserve is
                  registered  with the Securities and Exchange  Commission  (the
                  "SEC") as an open-end management  investment company under the
                  Investment  Company Act of 1940,  as amended (the "1940 Act"),
                  and such registration is in full force and effect.

         4.2.     It has  power to own all of its  properties  and  assets  and,
                  subject to the approval of shareholders referred to herein, to
                  carry out and consummate the transactions contemplated hereby,
                  and has all necessary federal,  state and local authorizations
                  to  carry  on its  business  as  now  being  conducted  and to
                  consummate the transactions contemplated by this Agreement.

         4.3.     This  Agreement  has  been  duly   authorized,   executed  and
                  delivered  by ACMF,  and  represents  ACMF's valid and binding
                  contract, enforceable in accordance with its terms, subject as
                  to  enforcement  to  bankruptcy,  insolvency,  reorganization,
                  arrangement,  moratorium,  and other  similar  laws of general
                  applicability  relating to or affecting  creditors' rights and
                  to general principles of equity. The execution and delivery of
                  this Agreement does not and will not, and the  consummation of
                  the  transactions  contemplated  by this  Agreement  will not,
                  violate  ACMF's  Articles of  Incorporation,  By-laws,  or any
                  agreement or arrangement to which it is a party or by which it
                  is bound.

         4.4.     Cash  Reserve has elected to qualify  and has  qualified  as a
                  "regulated  investment  company"  under Subtitle A, Chapter 1,
                  Subchapter  M, Part I of the  Code,  as of and since its first
                  taxable year; has been a regulated  investment  company at all
                  times  since  the end of its  first  taxable  year  when it so
                  qualified;  and qualifies  and shall  continue to qualify as a
                  regulated investment company until the Effective Time.

         4.5.     All  federal,   state,  local  and  foreign  income,  profits,
                  franchise,  sales,  withholding,  customs,  transfer and other
                  taxes,  including  interest,  additions  to tax and  penalties
                  (collectively, "Taxes") relating to the Cash Reserve Assets or
                  properly  shown to be due on any return  filed by Cash Reserve
                  with respect to taxable periods ending on or prior to, and the
                  portion of any interim period up to, the date hereof have been
                  fully  and  timely  paid or  provided  for;  and  there are no
                  levies,   liens,  or  other  encumbrances  relating  to  Taxes
                  existing,  threatened  or  pending  with  respect  to the Cash
                  Reserve Assets.

         4.6.     The  financial  statements of Cash Reserve for the fiscal year
                  ended  October  31,  1997,  audited by  Deloitte & Touche LLP,
                  independent  auditors,  copies of which  have been  previously
                  furnished to ACIT,  present  fairly the financial  position of
                  Cash  Reserve as of October  31,  1997 and the  results of its
                  operations  for the  year  then  ending,  in  conformity  with
                  generally accepted accounting principles.

         4.7.     Prior to the Valuation  Time, Cash Reserve shall have declared
                  a dividend or  dividends,  with a record date and  ex-dividend
                  date prior to such Valuation  Time,  which,  together with all
                  previous  dividends,  shall have the effect of distributing to
                  its shareholders all of its investment company taxable income,
                  if any,  for the  taxable  periods or years ended on or before
                  Cash Reserve's most recent fiscal year end, and for the period
                  from said date to and including the Effective  Time  (computed
                  without regard to any deduction for dividends  paid),  and all
                  of its net capital gain, if any,  realized in taxable  periods
                  or years ended on or before Cash Reserve's fiscal year end and
                  for the period from said date to and  including  the Effective
                  Time.

         4.8.     At both the Valuation Time and the Effective Time, there shall
                  be no known  liabilities  of Cash  Reserve,  whether  accrued,
                  absolute,  contingent or  otherwise,  not reflected in the net
                  asset value per share of its outstanding shares.

         4.9.     There  are  no  legal,  administrative  or  other  proceedings
                  pending or, to ACMF's  knowledge  threatened,  against ACMF or
                  Cash  Reserve  which could  result in liability on the part of
                  Cash Reserve.

         4.10.    Subject to the approval of shareholders, at both the Valuation
                  Time and the Effective  Time, it shall have full right,  power
                  and authority to sell,  assign,  transfer and deliver the Cash
                  Reserve  Assets and,  upon  delivery  and payment for the Cash
                  Reserve  Assets as  contemplated  herein,  Prime shall acquire
                  good and marketable title thereto, free and clear of all liens
                  and  encumbrances,  and  subject  to no  restrictions  on  the
                  ownership or transfer thereof (except as imposed by federal or
                  state securities laws).

         4.11.    No consent,  approval,  authorization or order of any court or
                  governmental  authority  is required for the  consummation  by
                  ACMF  of the  transactions  contemplated  by  this  Agreement,
                  except  such  as may be  required  under  the  1933  Act,  the
                  Securities  Exchange Act of 1934, as amended (the "1934 Act"),
                  the 1940 Act, the rules and regulations  under those Acts, and
                  state securities laws.

         4.12.    Insofar  as the  following  relate to ACMF,  the  registration
                  statement filed by ACIT on Form N-14 relating to the shares of
                  Prime that will be  registered  with the SEC  pursuant to this
                  Agreement,  which,  without limitation,  shall include a proxy
                  statement of ACMF and the  prospectus  of ACIT with respect to
                  the  transactions  contemplated  by  this  Agreement,  and any
                  supplement or amendment thereto or to the documents  contained
                  or incorporated  therein by reference (the "N-14  Registration
                  Statement"),  on the effective  date of the N-14  Registration
                  Statement,  at the time of any shareholders'  meeting referred
                  to herein and at the Effective  Time:  (i) shall comply in all
                  material  respects  with the  provisions  of the 1933 Act, the
                  1934  Act  and  the  1940  Act,  the  rules  and   regulations
                  thereunder,  and state  securities  laws,  and (ii)  shall not
                  contain  any untrue  statement  of a material  fact or omit to
                  state  a  material  fact  required  to be  stated  therein  or
                  necessary  to make  the  statements  therein  not  misleading;
                  provided,  however, that the representations and warranties in
                  this subsection shall apply only to statements in or omissions
                  from the N-14 Registration Statement made in reliance upon and
                  in conformity  with  information  furnished by ACMF for use in
                  the N-14 Registration Statement.

         4.13.    All of the issued and outstanding  shares of Cash Reserve have
                  been   duly  and   validly   issued,   are   fully   paid  and
                  non-assessable,   and  were  offered  for  sale  and  sold  in
                  conformity  with all applicable  federal and state  securities
                  laws,  and no  shareholder  of Cash Reserve has any preemptive
                  right of subscription or purchase in respect of such shares.

5.       CERTAIN REPRESENTATIONS, WARRANTIES AND AGREEMENTS OF ACIT.

         ACIT,  on behalf of itself and Prime,  represents  and warrants to, and
         agrees with, ACMF as follows:

         5.1.     ACIT is a Massachusetts  business trust duly created  pursuant
                  to a  Declaration  of Trust  for the  purpose  of  acting as a
                  management  investment  company  under  the  1940  Act  and is
                  validly  existing  under the laws of, and duly  authorized  to
                  transact business in, the Commonwealth of Massachusetts. Prime
                  is  registered   with  the  SEC  as  an  open-end   management
                  investment company under the 1940 Act and such registration is
                  in full force and effect.

         5.2.     It has the power to own all of its  properties  and assets and
                  to carry  out and  consummate  the  transactions  contemplated
                  herein,  and  has  all  necessary  federal,  state  and  local
                  authorizations to carry on its business as now being conducted
                  and  to  consummate  the  transactions  contemplated  by  this
                  Agreement.

         5.3.     This  Agreement  has  been  duly   authorized,   executed  and
                  delivered  by ACIT,  and  represents  ACIT's valid and binding
                  contract, enforceable in accordance with its terms, subject as
                  to  enforcement  to  bankruptcy,  insolvency,  reorganization,
                  arrangement,  moratorium,  and other  similar  laws of general
                  applicability  relating to or affecting  creditors' rights and
                  to general principles of equity. The execution and delivery of
                  this   Agreement  did  not,  and  the   consummation   of  the
                  transactions  contemplated by this Agreement will not, violate
                  ACIT's  Declaration  of Trust or By-laws or any  agreement  or
                  arrangement to which it is a party or by which it is bound.

         5.4.     Prime  has  elected  to  qualify,  and  has  qualified,  as  a
                  "regulated  investment  company"  under Subtitle A, Chapter 1,
                  Subchapter  M, Part I of the  Code,  as of and since its first
                  taxable year; and has been a regulated  investment  company at
                  all times since the end of its first  taxable  year when it so
                  qualified  and  intends to  continue to qualify as a regulated
                  investment company.

         5.5.     The  financial  statements  of Prime for its fiscal year ended
                  March 31,  1998,  audited by  Coopers &  Lybrand,  independent
                  auditors,  copies of which have been  previously  furnished to
                  ACMF,  present  fairly the  financial  position of Prime as of
                  March 31, 1998 and the results of its  operations for the year
                  then ending, in conformity with generally accepted  accounting
                  principles.

         5.6.     At both the Valuation Time and the Effective Time, there shall
                  be no known liabilities of Prime,  whether accrued,  absolute,
                  contingent or otherwise,  not reflected in the net asset value
                  per  share  of  its  shares  to be  issued  pursuant  to  this
                  Agreement.

         5.7.     There  are  no  legal,  administrative  or  other  proceedings
                  pending or, to its knowledge, threatened against ACIT or Prime
                  that could result in liability on the part of ACIT or Prime.

         5.8.     No consent,  approval,  authorization or order of any court or
                  governmental  authority  is required for the  consummation  by
                  ACIT  of the  transactions  contemplated  by  this  Agreement,
                  except  such as may be required  under the 1933 Act,  the 1934
                  Act, the 1940 Act, the rules and regulations under those Acts,
                  and state securities laws.

         5.9.     Insofar as the following relate to ACIT, the N-14 Registration
                  Statement  on  its   effective   date,  at  the  time  of  any
                  shareholders' meetings referred to herein and at the Effective
                  Time:  (i) shall  comply  in all  material  respects  with the
                  provisions of the 1933 Act, the 1934 Act and the 1940 Act, the
                  rules and regulations  thereunder,  and state securities laws,
                  and (ii) shall not contain any untrue  statement of a material
                  fact or omit to state a material  fact  required  to be stated
                  therein  or  necessary  to make  the  statements  therein  not
                  misleading;  provided,  however,  that the representations and
                  warranties in this  subsection  shall apply only to statements
                  in or omissions from the N-14  Registration  Statement made in
                  reliance upon and in conformity with information  furnished by
                  ACIT for use in the N-14 Registration Statement.

         5.10.    The shares of Prime to be issued and delivered to Cash Reserve
                  for the  account of record  holders of shares of Cash  Reserve
                  pursuant to the terms hereof  shall have been duly  authorized
                  as of the Effective  Time and,  when so issued and  delivered,
                  shall be  registered  under  the 1933  Act,  duly and  validly
                  issued,  fully paid and non-assessable,  and no shareholder of
                  ACIT  shall  have  any  preemptive  right of  subscription  or
                  purchase in respect thereto.

6.       SHAREHOLDER ACTION ON BEHALF OF CASH RESERVE.

         6.1.     As soon as  practicable  after the effective  date of the N-14
                  Registration  Statement,   but  in  any  event  prior  to  the
                  Effective Time and as a condition to the  Reorganization,  the
                  Board of Directors of ACMF shall call,  and ACMF shall hold, a
                  meeting of the shareholders of Cash Reserve for the purpose of
                  considering and voting upon:

                  6.1.1.   Approval  of  this  Agreement  and  the  transactions
                           contemplated hereby, including, without limitation:

                           6.1.1.1. The transfer of the Cash  Reserve  Assets to
                                    Prime,  and the  assumption  by Prime of the
                                    Cash  Reserve  Liabilities,  in exchange for
                                    shares  of  Prime,   as  described  in  this
                                    Agreement; and

                           6.1.1.2. The  liquidation of Cash Reserve through the
                                    distribution to its record holders of shares
                                    of the shares of Prime as  described in this
                                    Agreement; and

                  6.1.2.   Such other  matters as may be determined by the Board
                           of Directors or authorized officers of the parties.

         6.2.     Approval of this Reorganization  Agreement by the shareholders
                  of Cash Reserve shall constitute the waiver of the application
                  of any fundamental policy of Cash Reserve that might be deemed
                  to  prevent   them  from  taking  the  actions   necessary  to
                  effectuate the Reorganization as described, and such policies,
                  if any, shall be deemed to have been amended accordingly.

7.       REGISTRATION STATEMENT AND PROXY SOLICITATION MATERIALS.

         The N-14  Registration  Statement  under  the 1933 Act,  including  the
         combined  prospectus/proxy  statement  contained therein under the 1934
         Act and 1940 Act proxy  rules,  shall be filed with the SEC as promptly
         as  practicable.  ACIT and ACMF have  cooperated  and shall continue to
         cooperate  with each other,  and have  furnished and shall  continue to
         furnish each other with the information  relating to themselves that is
         required  by the 1933 Act,  the 1934 Act,  the 1940 Act,  the rules and
         regulations  under each of those Acts and state  securities laws, to be
         included in the N-14 Registration Statement.

8.       EFFECTIVE TIME OF THE REORGANIZATION.

         Delivery  of the Cash  Reserve  Assets  and the  shares  of Prime to be
         issued  pursuant  to  Section  1 and the  liquidation  of Cash  Reserve
         pursuant  to Section 2 shall  occur at the  opening of  business on the
         next business day following the Valuation  Time, or on such other date,
         and at such place and time,  as may be  determined  by the President or
         any Vice  President  of each party  hereto.  The date and time at which
         such actions are taken are referred to herein as the "Effective  Time."
         To the extent any of the Cash Reserve  Assets are, for any reason,  not
         transferred at the Effective  Time,  ACMF shall cause such Cash Reserve
         Assets to be  transferred  in  accordance  with this  Agreement  at the
         earliest practicable date thereafter.

9.       ACIT'S CONDITIONS.

         The  obligations  of ACIT  hereunder  with  respect  to Prime  shall be
         subject to the following conditions precedent:

         9.1.     This  Agreement  and  the  transactions  contemplated  by this
                  Agreement shall have been approved by the shareholders of Cash
                  Reserve, in the manner required by law.

         9.2.     ACMF shall have duly executed and delivered to ACIT such bills
                  of sale,  assignments,  certificates and other  instruments of
                  transfer  ("Transfer   Documents")  as  may  be  necessary  or
                  desirable  to transfer  all right,  title and interest of ACMF
                  and Cash Reserve in and to the Cash Reserve  Assets.  The Cash
                  Reserve  Assets shall be  accompanied  by all necessary  state
                  stock  transfer  stamps or cash for the  appropriate  purchase
                  price therefor.

         9.3.     All  representations  and  warranties  made in this  Agreement
                  shall be true and correct in all material  respects as if made
                  at and as of the Valuation Time and the Effective  Time. As of
                  the Valuation  Time and the Effective  Time,  there shall have
                  been no material  adverse change in the financial  position of
                  Cash Reserve  since  October 31, 1997 other than those changes
                  incurred in the ordinary  course of business as an  investment
                  company.   No  action,  suit  or  other  proceeding  shall  be
                  threatened or pending before any court or governmental  agency
                  in which it is  sought  to  restrain  or  prohibit,  or obtain
                  damages or other relief in connection  with, this Agreement or
                  the transactions contemplated herein.

         9.4.     ACIT shall have  received an opinion of counsel  acceptable to
                  ACMF,  addressed  to  ACIT  and  ACMF  in  a  form  reasonably
                  satisfactory   to  them  and   dated   the   Effective   Time,
                  substantially  to the  effect  that  for  federal  income  tax
                  purposes:   (i)  the  transfer  of  the  Cash  Reserve  Assets
                  hereunder,  and the  assumption  by Prime of the Cash  Reserve
                  Liabilities,   in  exchange  for  shares  of  Prime,  and  the
                  distribution  of  said  shares  to the  shareholders  of  Cash
                  Reserve,  as provided in this  Agreement,  will  constitute  a
                  reorganization  within the meaning of Section 368 of the Code,
                  and Cash Reserve and Prime will each be considered "a party to
                  a reorganization"  within the meaning of Section 368(b) of the
                  Code;  (ii) no gain or loss will be recognized by Cash Reserve
                  as a result of such transaction; (iii) no gain or loss will be
                  recognized by Prime as a result of such  transaction;  (iv) no
                  gain or loss will be  recognized by the  shareholders  of Cash
                  Reserve on the  distribution to them by Cash Reserve of shares
                  of Prime in exchange for their shares of Cash Reserve; (v) the
                  aggregate basis of Prime shares  received by each  shareholder
                  of Cash Reserve will be the same as the aggregate basis of the
                  shareholder's  Cash Reserve  shares  immediately  prior to the
                  transaction;  (vi) the  basis of the Cash  Reserve  Assets  to
                  Prime will be the same as the basis of the Cash Reserve Assets
                  in  the  hands  of  Cash  Reserve  immediately  prior  to  the
                  exchange;  (vii) a  shareholder's  holding  period  for  Prime
                  shares will be  determined  by including  the period for which
                  the  shareholder  held the  shares of Cash  Reserve  exchanged
                  therefor,  provided that the  shareholder  held such shares of
                  Cash Reserve as a capital asset; and (viii) the holding period
                  of Prime with respect to the Cash Reserve  Assets will include
                  the period for which the Cash Reserve Assets were held by Cash
                  Reserve.

         9.5.     The SEC shall not have issued any unfavorable  advisory report
                  under  Section  25(b)  of the  1940  Act  nor  instituted  any
                  proceeding seeking to enjoin  consummation of the transactions
                  contemplated by this Agreement under Section 25(c) of the 1940
                  Act.

         9.6.     The N-14  Registration  Statement shall have become  effective
                  under  the  1933  Act  and  no  stop  order   suspending  such
                  effectiveness  shall have been instituted or, to the knowledge
                  of ACIT,  contemplated  by the SEC, and the parties shall have
                  received all permits and other authorizations  necessary under
                  state   securities   laws  to  consummate   the   transactions
                  contemplated by this Agreement.

         9.7.     The President or a Vice President of ACMF shall have certified
                  that ACMF has performed and complied in all material  respects
                  with each of its  agreements  and  covenants  required by this
                  Agreement to be  performed or complied  with by it prior to or
                  at the Valuation Time and the Effective Time.

10.      ACMF'S CONDITIONS.

         The obligations of ACMF hereunder with respect to Cash Reserve shall be
         subject to the following conditions precedent:

         10.1.    This  Agreement  and  the  transactions  contemplated  by this
                  Agreement shall have been approved by the shareholders of Cash
                  Reserve, in the manner required by law.

         10.2.    All  representations  and  warranties  of  ACIT  made  in this
                  Agreement  shall be true and correct in all material  respects
                  as if made at and as of the  Valuation  Time and the Effective
                  Time. As of the Valuation Time and the Effective  Time,  there
                  shall have been no material  adverse  change in the  financial
                  condition  of Prime  since  March 31,  1998  other  than those
                  changes  incurred  in the  ordinary  course of  business as an
                  investment  company. No action, suit or other proceeding shall
                  be  threatened  or pending  before  any court or  governmental
                  agency in which it is  sought  to  restrain  or  prohibit,  or
                  obtain  damages  or other  relief  in  connection  with,  this
                  Agreement or the transactions contemplated herein.

         10.3.    ACMF shall have  received an opinion of counsel  acceptable to
                  ACMF,  addressed  to  ACIT  and  ACMF  in  a  form  reasonably
                  satisfactory  to them  and  dated  the  Effective  Time,  with
                  respect to the matters specified in Section 9.4.

         10.4.    The N-14  Registration  Statement shall have become  effective
                  under  the  1933  Act  and  no  stop  order   suspending  such
                  effectiveness shall have been instituted,  or to the knowledge
                  of ACIT,  contemplated  by the SEC, and the parties shall have
                  received all permits and other authorizations  necessary under
                  state   securities   laws  to  consummate   the   transactions
                  contemplated by this Agreement.

         10.5.    ACMF  shall not sell or  otherwise  dispose  of any  shares of
                  Prime to be received in the transactions  contemplated herein,
                  except in  distribution  to its  shareholders  as contemplated
                  herein.

         10.6.    The SEC shall not have issued any unfavorable  advisory report
                  under  Section  25(b)  of the  1940  Act  nor  instituted  any
                  proceeding seeking to enjoin  consummation of the transactions
                  contemplated by this Agreement under Section 25(c) of the 1940
                  Act.

         10.7.    The President or a Vice President of ACIT shall have certified
                  that ACIT has performed and complied in all material  respects
                  with each of its  agreements  and  covenants  required by this
                  Agreement to be  performed or complied  with by it prior to or
                  at the Valuation Time and the Effective Time.

11.      TAX DOCUMENTS.

         ACMF shall deliver to ACIT at the Effective Time confirmations or other
         adequate  evidence  as to the  adjusted  tax basis of the Cash  Reserve
         Assets then  delivered  to Prime in  accordance  with the terms of this
         Agreement.

12.      FURTHER ASSURANCES.

         Subject  to the  terms  and  conditions  herein  provided,  each of the
         parties  hereto  shall  use its best  efforts  to take,  or cause to be
         taken, such action, to execute and deliver, or cause to be executed and
         delivered,  such additional  documents and  instruments,  and to do, or
         cause to be done, all things  necessary,  proper or advisable under the
         provisions of this Agreement and under applicable law to consummate and
         make effective the transactions contemplated by this Agreement.

13.      TERMINATION OF REPRESENTATIONS AND WARRANTIES.

         The  representations  and  warranties  of the parties set forth in this
         Agreement shall terminate at the Effective Time.

14.      TERMINATION OF AGREEMENT.

         14.1.    This  Agreement may be terminated  prior to the Effective Time
                  by the Board of Trustees of ACIT or the Board of  Directors of
                  ACMF, as provided below:

                  14.1.1.  By ACIT if the  conditions set forth in Section 9 are
                           not satisfied as specified in said Section;

                  14.1.2.  By ACMF if the conditions set forth in Section 10 are
                           not satisfied as specified in said Section;

                  14.1.3.  By the mutual consent of the parties.

         14.2.    If a party  terminates  this Agreement  because one or more of
                  its conditions  precedent have not been fulfilled,  or if this
                  Agreement is terminated by mutual consent, this Agreement will
                  become null and void without any  liability of either party or
                  any of their  investment  portfolios  to the other;  provided,
                  however,  that if such  termination  is by  ACIT  pursuant  to
                  Section  14.1.1  as a result of a breach by ACMF of any of its
                  representations, warranties or covenants in this Agreement, or
                  such  termination  is by ACMF pursuant to Section  14.1.2 as a
                  result  of a  breach  by ACIT  of any of its  representations,
                  warranties  or covenants  in this  Agreement,  nothing  herein
                  shall  affect the  non-breaching  party's  right to damages on
                  account of such other party's breach.

15.      AMENDMENT AND WAIVER.

         At any time prior to or (to the fullest extent  permitted by law) after
         approval of this Agreement by the shareholders of ACMF, (a) the parties
         hereto may, by written  agreement  authorized by their respective Board
         of  Directors  or  Trustees,  as the case may be,  or their  respective
         Presidents or any Vice Presidents,  and with or without the approval of
         their shareholders,  amend any of the provisions of this Agreement, and
         (b) either party may waive any breach by the other party or the failure
         to satisfy any of the conditions to its obligations  (such waiver to be
         in writing  and  executed by the  President  or Vice  President  of the
         waiving   party  with  or  without  the   approval   of  such   party's
         shareholders).

16.      GOVERNING LAW.

         This  Agreement  and the  transactions  contemplated  hereby  shall  be
         governed,  construed  and  enforced  in  accordance  with  the  laws of
         Massachusetts  without giving effect to the conflicts of law principles
         otherwise applicable therein.

17.      SUCCESSORS AND ASSIGNS.

         This  Agreement  shall be binding upon the  respective  successors  and
         permitted assigns of the parties hereto. This Agreement and the rights,
         obligations  and  liabilities  hereunder  may not be assigned by either
         party without the consent of the other party.

18.      BENEFICIARIES.

         Nothing contained in this Agreement shall be deemed to create rights in
         persons not parties  hereto,  other than the  successors  and permitted
         assigns of the parties.

19.      ACIT LIABILITY.

         19.1.    The name "American Century  Investment Trust" and "Trustees of
                  American Century  Investment Trust" refer  respectively to the
                  trust   created  and  the   trustees,   as  trustees  but  not
                  individually or personally,  acting from time to time under an
                  Agreement  and  Declaration  of Trust dated June 16, 1993,  as
                  amended,  which is hereby  referred to and copies of which are
                  on  file  at  the  office  of  the  State   Secretary  of  the
                  Commonwealth of  Massachusetts  and at the principal office of
                  ACIT.  The  obligations of ACIT entered into in the name or on
                  behalf  thereof  by any of its  trustees,  representatives  or
                  agents are made not individually,  but in such capacities, and
                  are not  binding  upon any of the  trustees,  shareholders  or
                  representatives  of ACIT  personally,  but bind only the trust
                  property,  and all persons  dealing with any portfolio of ACIT
                  must  look  solely  to the trust  property  belonging  to such
                  portfolio for the enforcement of any claims against ACIT.

         19.2.    Both  parties  specifically  acknowledge  and  agree  that any
                  liability of ACIT under this  Agreement with respect to Prime,
                  or in connection  with the  transactions  contemplated  herein
                  with  respect to Prime,  shall be  discharged  only out of the
                  assets of Prime and that no other  portfolio of ACIT,  if any,
                  shall be liable with respect thereto.

20.      ACMF LIABILITY.

         Both parties  specifically  acknowledge and agree that any liability of
         ACMF  under  this  Agreement  with  respect  to  Cash  Reserve,  or  in
         connection with the  transactions  contemplated  herein with respect to
         Cash Reserve,  shall be discharged  only out of the Cash Reserve Assets
         and that no  other  portfolio  of ACMF  shall be  liable  with  respect
         thereto.

21.      NOTICES.

         All notices  required or permitted herein shall be in writing and shall
         be  deemed  to  be  properly  given  when  delivered  personally  or by
         telecopier to the party  entitled to receive the notice or when sent by
         certified  or  registered  mail,  postage  prepaid,  or  delivered to a
         nationally  recognized overnight courier service, in each case properly
         addressed  to the party  entitled to receive such notice at the address
         or  telecopier  number  stated  below  or  to  such  other  address  or
         telecopier  number as may  hereafter  be furnished in writing by notice
         similarly given by one party to the other party hereto:

         If to American  Century  Investment  Trust or American  Century  Mutual
         Funds, Inc.:

                                Patrick A. Looby
                                4500 Main Street
                           Kansas City, Missouri 64111

22.      EXPENSES.

         Each  party  represents  to the other  that its  expenses  incurred  in
         connection with the  Reorganization  will be borne by American  Century
         Investment Management, Inc. or one or more of its affiliates.

23.      ENTIRE AGREEMENT.

         This Agreement  embodies the entire agreement and  understanding of the
         parties   hereto  and   supersedes   any  and  all  prior   agreements,
         arrangements  and  understandings  relating  to  matters  provided  for
         herein.

24.      COUNTERPARTS.

         This Agreement may be executed in any number of  counterparts,  each of
         which,  when executed and delivered  shall be deemed to be an original,
         but all of which together shall constitute one and the same instrument.



         IN WITNESS  WHEREOF,  the parties hereto have caused this instrument to
be executed by their duly authorized  officers  designated  below as of the date
first written above.


AMERICAN CENTURY INVESTMENT TRUST

ATTEST:


- ----------------------------------------- By:----------------------------


AMERICAN CENTURY MUTUAL FUNDS, INC.

ATTEST:


- ----------------------------------------- By:----------------------------