21+50+15=86. ]! s$ _- _# y3 ?" E* e
why 86...公仔箱論壇0 A0 i6 A' h7 P
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21www2.tvboxnow.com$ C( r' H4 D; N3 n2 |: m
then he giv bck his fren 50www2.tvboxnow.com t( N3 f! p( G$ e$ v) _
and the shoes cost is 151 j3 a* {" e2 ]7 ^/ Q. W( D- z
公仔箱論壇: q6 ?! [6 n( ]( B! |
so total he loss is 86..." z6 f* w9 p* {% E- R
n3 U* N' S1 J% utvb now,tvbnow,bttvb[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |