WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE. EXHIBIT 11 ROTO-ROOTER, INC. AND SUBSIDIARY COMPANIES COMPUTATION OF PER SHARE EARNINGS (a) (in thousands except per share amount) UNAUDITED <F1> Three Months Ended Six Months Ended June 30, June 30, ------------------- ----------------- 1996 1995 1996 1995 ------- ------- ------ ------- Computation of Earnings Per Common Share and Common Equivalent Share: - --------------------------- Net Income $ 2,785 $ 2,225 $ 5,344 $ 4,476 ======= ======= ======= ======= Average Number of Shares Used to Compute Earnings per Common Share 5,158 5,088 5,151 5,085 Effect of Unexercised Stock Options 62 43 56 38 ------- ------- ------- ------- Average Number of Shares Used to Compute Earnings per Common and Common Equivalent Share 5,220 5,131 5,207 5,123 ======= ======= ======= ======= Earnings per Common and Common Equivalent Share $ .53 $ .43 $ 1.03 $ .87 ======= ======= ======= ======= Computation of Earnings Per Common Share Assuming Full Dilution: - --------------------------- Net Income $ 2,785 $ 2,225 $ 5,344 $ 4,476 ======= ======= ======= ======= Average Number of Shares Used to Compute Earnings per Common Share 5,158 5,088 5,151 5,085 Effect of Unexercised Stock Options 65 51 67 51 ------- ------- ------- ------- Average Number of Shares Used to Compute Earnings per Common Share Assuming Full Dilution 5,223 5,139 5,218 5,136 ======= ======= ======= ======= Earnings per Common Share Assuming Full Dilution $ .53 $ .43 $ 1.02 $ .87 ======= ======= ======= ======= - ------------------ <F1> (a) This calculation is submitted in accordance with Regulation S-K, Item 601(b)(11), although not required by footnote 2 to paragraph 14 of APB Opinion No. 15 because it results in dilution of less than 3%,including fractional cents per share. E - 1 Page 12 of 13