21+50+15=86
" B: t' l6 R7 z9 o0 [. ~5.39.217.76why 86...) m+ W: N$ k# R% L& o( R
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
+ n0 L8 b( ^$ ~then he giv bck his fren 50
; t( | _' W7 y# M. Nand the shoes cost is 15tvb now,tvbnow,bttvb: H. `$ P# K. ~ d7 b, Q
0 o7 X1 J1 o2 c6 |& G* `* A公仔箱論壇so total he loss is 86...
; k7 u! ~" R% O) ^) | y# ttvb now,tvbnow,bttvb: T' `5 j8 I8 ?) j8 e
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |