EXHIBIT 11 OGDEN CORPORATION AND SUBSIDIARIES DETAIL OF COMPUTATION OF EARNINGS APPLICABLE TO COMMON STOCK FOR THE THREE MONTHS ENDED MARCH 31, 1994 1993 (In Thousands) NUMBER OF SHARES USED FOR COMPUTATION OF EARNINGS PER SHARE: Average number of common shares 43,528 43,226 NUMBER OF SHARES USED FOR COMPUTATION OF EARNINGS PER SHARE ASSUMING FULL DILUTION: Average number of common shares 43,528 43,226 Shares issuable for conversion of preferred stock 337 368 Shares issuable for conversion of debentures 107 Number of shares used for computation 43,865 43,701 COMPUTATION OF EARNINGS APPLICABLE TO COMMON SHARES: Income before cumulative effect of changes in accounting principles $ 15,328 $ 13,822 Add (less): adjustments arising from minority interests in consolidated subsidiaries 1 dividends on Ogden preferred stock (47) (51) Consolidated income applicable to Ogden common stock $ 15,281 $ 13,772 Cumulative effect of changes in accounting principles (1,520) $ (5,340) COMPUTATION OF EARNINGS APPLICABLE TO COMMON SHARES- ASSUMING FULL DILUTION: Income before cumulative effect of changes in accounting principles $ 15,328 $ 13,822 Add (less): adjustments arising from minority interests in consolidated subsidiaries 1 debenture interest-net of applicable income taxes 12 Consolidated income applicable to Ogden common stock $ 15,328 $ 13,835 Cumulative effect of changes in accounting principles $ (1,520) $ (5,340) Note: Earnings per common share was computed by dividing income, increased (decreased) for adjustments arising from minority interest in consolidated subsidiaries, reduced by preferred stock dividends requirements, by the weighted average of the number of shares of common stock and common stock equivalents, where dilutive, outstanding during each period. Earnings per common share, assuming full dilution, was computed on the assumption that all convertible debentures, convertible preferred stock, and stock options converted or exercised during each period, or outstanding at the end of each period were converted at the beginning of each period or the date of issuance or grant, if dilutive. This computation provides for the elimination of related convertible debenture interest and preferred dividends.