21+50+15=86tvb now,tvbnow,bttvb3 c P; {; V C& {' z- u0 E
why 86...* B' l4 N f+ n' Q
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
% F2 {9 P( p9 G. uthen he giv bck his fren 50
% c' }3 _0 O" a( t7 uTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。and the shoes cost is 15( ~) `, B' G1 D$ p
www3.tvboxnow.com7 T3 t9 u: q( y5 D# v
so total he loss is 86...; S7 Y& J# }5 G) [
% H2 B' }5 Z. j+ x" l; l7 X( F公仔箱論壇[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |