EXHIBIT 11.1 EMCON COMPUTATION OF INCOME PER SHARE (In thousands except per share data) Three months ended Six months ended June 30, June 30, 1996 1995 1996 1995 ---- ---- ---- ---- Net income ......................................................... $ 365 $ 711 $ 399 $1,108 Proforma interest income related to modified treasury stock method ........................................... 58 54 116 109 ------ ------ ------ ------ Adjusted net income ................................................ $ 457 $ 765 $ 515 $1,217 ====== ====== ====== ====== Weighted average number of common shares outstanding during the period ...................................... 8,481 8,245 8,463 8,235 Common equivalent share from outstanding stock options using the modified treasury stock method .................................................... 716 680 799 679 Incremental shares to reflect full dilution (1) ................. 0 0 0 0 ------ ------ ------ ------ Total shares for purposes of calculating diluted income per share (1) ............................................... 9,197 8,925 9,242 8,914 ====== ====== ====== ====== Primary income per share ........................................... $ 0.05 $ 0.09 $ 0.06 $ 0.14 ====== ====== ====== ====== Fully diluted income per share ..................................... $ 0.05 $ 0.09 $ 0.06 $ 0.14 ====== ====== ====== ====== - ----------------------- (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%. 18