EXHIBIT 11.1 EMCON COMPUTATION OF INCOME PER SHARE (In thousands except per share data) Three months ended Nine months ended September 30, September 30, 1995 1994 1995 1994 ---- ---- ---- ---- Net income ............................. $ 650 $ 695 $1,758 $1,253 Proforma interest income related to modified treasury stock method ... 59 49 194 99 ------- ------ ------ ------ Adjusted net income .................... $ 709 $ 744 $1,952 $1,352 ======= ====== ====== ====== Weighted average number of common shares outstanding during the period .......... 8,296 8,153 8,255 7,856 Common equivalent share from outstanding stock options using the modified treasury stock method ...... 657 573 660 462 Incremental shares to reflect full dilution (1) ........................ 0 0 0 0 ------ ------ ------ ------ Total shares for purposes of calculating diluted income per share (1) ........... 8,953 8,726 8,915 8,318 ====== ====== ====== ====== Primary income per share ............... $ 0.08 $ 0.09 $ 0.22 $ 0.16 ====== ====== ====== ====== Fully diluted income per share ......... $ 0.08 $ 0.09 $ 0.22 $ 0.16 ====== ====== ====== ====== - ----------------------- (1) This calculation is submitted in accordance with Regulation S-K Item 601(b)(11) although not required by footnote 2 to paragraph 14 to APB opinion No. 15, because it results in dilution of less than 3%. 17