EXHIBIT 12 Ratio of Earnings to Fixed Charges and Ratio of Earnings to Fixed Charges and Preferred Stock Dividends (Dollars in millions) Nine Months Ended August 31, August 31, 1997 1996 Ratio of Earnings to Fixed Charges Earnings: Income before income taxes $ 2,917 $ 2,386 Add: Fixed charges, net 8,027 6,998 Income before income taxes and ------- ------- fixed charges, net $10,944 $ 9,384 Fixed charges: Total interest expense $ 7,952 $ 6,927 Interest factor in rents 74 70 ------- ------- Total fixed charges $ 8,026 $ 6,997 Ratio of earnings to fixed 1.4 1.3 charges Ratio of Earnings to Fixed Charges and Preferred Stock Dividends Earnings: Income before income taxes $ 2,917 $ 2,386 Add: Fixed charges, net 8,027 6,998 ------ ------ Income before income taxes and fixed charges, net $10,944 $ 9,384 Fixed charges: Total interest expense $ 7,952 $ 6,927 Interest factor in rents 74 70 Preferred stock dividends 85 74 ------- ------- Total fixed charges and preferred stock dividends $ 8,111 $ 7,071 Ratio of earnings to fixed 1.3 1.3 charges and preferred stock dividends Fiscal Year 1996 1995 1994 1993 1992 Ratio of Earnings to Fixed Charges Earnings: Income before income taxes $ 3,117 $ 2,292 $ 1,962 $ 2,175 $ 1,546 Add: Fixed charges, net 9,026 8,285 6,787 5,705 5,394 ------- ------- ------- ------- ------- Income before income taxes and $12,143 $10,577 $ 8,749 $ 7,880 $ 6,940 fixed charges, net ------- ------- ------- ------- ------- Fixed charges: Total interest expense $ 8,934 $ 8,190 $ 6,697 $ 5,620 $ 5,346 Interest factor in rents 92 95 90 85 80 ------- ------- ------- ------- ------- Total fixed charges $ 9,026 $ 8,285 $ 6,787 $ 5,705 $ 5,426 Ratio of earnings to fixed 1.3 1.3 1.3 1.4 1.3 charges Ratio of Earnings to Fixed Charges and Preferred Stock Dividends Earnings: Income before income taxes $ 3,117 $ 2,292 $ 1,962 $ 2,175 $ 1,546 Add: Fixed charges, net 9,026 8,285 6,787 5,705 5,394 ------- ------- ------- ------- ------- Income before income taxes and fixed charges, net $12,143 $10,577 $ 8,749 $ 7,880 $ 6,940 ------- ------- ------- ------- ------- Fixed charges: Total interest expense $ 8,934 $ 8,190 $ 6,697 $ 5,620 $ 5,346 Interest factor in rents 92 95 90 85 80 Preferred stock dividends 101 95 94 83 81 Total fixed charges and ------- ------- ------- ------- ------- preferred stock dividends $ 9,127 $ 8,380 $ 6,881 $ 5,788 $ 5,507 Ratio of earnings to fixed 1.3 1.3 1.3 1.4 1.3 charges and preferred stock dividends - ------------------- (1) For purposes of calculating the ratio of earnings to fixed charges and the ratio of earnings to fixed charges and preferred stock dividends, earnings consist of income before income taxes and fixed charges (exclusive of preferred stock dividends). Additionally, "earnings" in 1992 excludes a nonrecurring gain of $32.1 million from the initial public offering of 25.7% of SPS Transaction Services, Inc. For purposes of calculating both ratios, fixed charges include interest expenses, capitalized interest and that portion of rentals representative of an interest factor.