KEY ENERGY GROUP, INC. COMPUTATION OF PER SHARE EARNINGS EXHIBIT 11(a) THREE MONTHS ENDED NOVEMBER 30, 1997 AND 1996 Three Months Ended Three Months Ended November 30, 1997 November 30, 1996 ---------------------- --------------------- (Thousands, except per share Fully- Fully- amounts) Primary Diluted Primary Diluted Net Income and Adjusted Earnings: Net Income before income taxes and minority interest $7,831 $7,831 $2,396 $2,396 Effect of interest on debentures - 219 - 975 ----------------------- -------------------- Adjusted net income before income taxes and minority interest $7,831 $8,050 $2,396 $3,371 ====================== =================== Net Income $4,938 $4,938 $1,554 $1,554 Effect of interest on convertible debentures, net of tax effect - 138 - 649 ---------------------- ------------------- Adjusted net income $4,938 $5,076 $1,554 $2,203 Weighted Average Shares and Share Equivalents Outstanding: Weighted average shares outstanding (as reported) 14,126 14,126 10,425 10,425 Common Share equivalents issuable under stock option plans 1,453 1,682 347 373 Common share equivalents issuable on assumed conversion of WellTech warrants 86 94 122 150 Common share equivalents issuable on assumed conversion of convertible debentures - 4,259 - 5,333 Common share equivalents issuable on assumed conversion of CIT warrants - - - 693 Weighted average shares and share equivalents outstanding 15,665 20,161 10,894 16,974 Earnings per Share: Net income before income taxes and minority interest $0.50 $0.40 $0.22 $0.20 Net income $0.32 $0.25 $0.14 $0.13