Exhibit 11.1(a) Renal Treatment Centers, Inc. and Subsidiaries COMPUTATION OF PRIMARY AND FULLY DILUTED EARNINGS PER SHARE for the quarter ended March 31, 1996 Three Months Ended March 31, 1996 Primary Fully Diluted - ---------------------------------------------------------------------------------------- Net income $3,158,054 $3,158,054 Add back interest on note, tax effected -- 67,665 - ---------------------------------------------------------------------------------------- Net income available to common stockholders $3,158,054 $3,225,719 ======================================================================================== Weighted average number of shares outstanding 23,554,165 23,554,165 Weighted average number of maximum shares subject to exercise under outstanding stock options 1,349,743 1,349,743 Weighted average shares assumed issued upon conversion of note -- 661,501 - ---------------------------------------------------------------------------------------- 24,903,908 25,565,409 Less treasury shares assumed purchased with proceeds from assumed exercise of outstanding common stock options 625,473 583,641 - ---------------------------------------------------------------------------------------- Weighted average number of common and common stock 24,278,435 24,981,768 equivalents outstanding ======================================================================================== Net income per common and common stock equivalent $0.13 $0.13 ======================================================================================== Exhibit 11.1 Renal Treatment Centers, Inc. and Subsidiaries COMPUTATION OF PRIMARY AND FULLY DILUTED EARNINGS PER SHARE for the quarter ended March 31, 1995 Three Months Ended March 31, 1995 Primary Fully Diluted - ---------------------------------------------------------------------------------------- Net income $2,033,169 $2,033,169 Add back interest on note, tax effected -- 74,357 - ---------------------------------------------------------------------------------------- Net income available to common stockholders $2,033,169 $2,107,526 ======================================================================================== Weighted average number of shares outstanding 21,098,552 21,098,552 Weighted average number of maximum share subject to exercise under outstanding stock options 1,168,198 1,168,198 Weighted average shares assumed issued upon conversion of note -- 712,024 - ---------------------------------------------------------------------------------------- 22,266,750 22,978,774 Less treasury shares assumed purchased with proceeds from assumed exercise of outstanding common stock options 735,150 651,854 - ---------------------------------------------------------------------------------------- Weighted average number of common and common stock 21,531,600 22,326,920 equivalents outstanding ======================================================================================== Net income per common and common stock equivalent $0.09 $0.09 ========================================================================================