EXHIBIT 12(A) AMOCO ARGENTINA OIL COMPANY ------------------------ STATEMENT SETTING FORTH COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (MILLIONS OF DOLLARS, EXCEPT RATIOS) NINE MONTHS ENDED YEAR ENDED DECEMBER 31, SEPTEMBER --------------------------------- 30, 1996 1995 1994 1993 1992 1991 ------------ ----- ----- ----- ----- ----- Determination of Income: Consolidated earnings before income taxes and minority interest.................... $ 137 $ 110 $ 86 $ 110 $ 96 $ 195 Fixed charges expensed by consolidated companies................................ 7 11 5 -- -- -- Adjustments for certain companies accounted for by the equity method................. -- -- -- -- -- -- ------------ ----- ----- ----- ----- ----- Adjusted earnings plus fixed charges......... $ 144 $ 121 $ 91 $ 110 $ 96 $ 195 ------------ ----- ----- ----- ----- ----- ------------ ----- ----- ----- ----- ----- Determination of Fixed Charges: Consolidated interest on indebtedness (including interest capitalized)......... $ 7 $ 11 $ 5 $-- $-- $-- Consolidated rental expense representative of an interest factor.................... -- -- -- -- -- -- Adjustments for certain companies accounted for by the equity method................. -- -- -- -- -- -- ------------ ----- ----- ----- ----- ----- Total fixed charges.......................... $ 7 $ 11 $ 5 $-- $-- $-- ------------ ----- ----- ----- ----- ----- ------------ ----- ----- ----- ----- ----- Ratio of earnings to fixed charges........... 20.6 11 18.2 N/A N/A N/A