EXHIBIT 11 ROTO-ROOTER, INC. AND SUBSIDIARY COMPANIES COMPUTATION OF PER SHARE EARNINGS (a) (in thousands except per share amount) <F1> unaudited Three Months Ended Six Months Ended June 30, June 30, ------------------- ----------------- 1995 1994 1995 1994 ------- ------- -------- -------- Computation of Earnings Per Common Share and Common Equivalent Share: --------------------------- Net Income $ 2,225 $ 1,906 $ 4,476 $ 3,755 ======= ======= ======= ======= Average Number of Shares Used to Compute Earnings per Common Share 5,088 5,068 5,085 5,061 Effect of Unexercised Stock Options 43 57 38 66 ------- ------- ------- ------- Average Number of Shares Used to Compute Earnings per Common and Common Equivalent Share 5,131 5,125 5,123 5,127 ======= ======= ======= ======= Earnings per Common and Common Equivalent Share $ .43 $ .37 $ .87 $ .73 ======= ======= ======= ======= Computation of Earnings Per Common Share Assuming Full Dilution: --------------------------- Net Income $ 2,225 $ 1,906 $ 4,476 $ 3,755 ======= ======= ======= ======= Average Number of Shares Used to Compute Earnings per Common Share 5,088 5,068 5,085 5,061 Effect of Unexercised Stock Options 51 68 51 81 ------- ------- ------- ------- Average Number of Shares Used to Compute Earnings per Common Share Assuming Full Dilution 5,139 5,136 5,136 5,142 ======= ======= ======= ======= Earnings per Common Share Assuming Full Dilution $ .43 $ .37 $ .87 $ .73 ======= ======= ======= ======= ------------------ <F1> (a) This calculation is submitted in accordance with Regulation S-K, Item 601(b)(11), although not required by footnote 2 to paragraph 14 of APB Opinion No. 15 because it results in dilution of less than 3%, including fractional cents per share. E - 1 Page 12 of 13