21+50+15=86公仔箱論壇$ q* A( ^) r+ v. g4 k+ ?
why 86...' l9 P: h9 |& q2 T! V3 \7 c
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21 ) j+ G2 Q7 ~! @, ~* L) d G2 J0 G1 S3 @公仔箱論壇then he giv bck his fren 50% h1 ^& Y, F C+ x" i/ u2 u
and the shoes cost is 15 % g5 S% W h: \$ Z' m; e9 K; j公仔箱論壇! F8 C& P6 J' U4 l
so total he loss is 86... % K- C3 Y1 ?6 Y3 Y6 v公仔箱論壇 1 A: a+ m& j; H( rwww2.tvboxnow.com[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ]