21+50+15=86公仔箱論壇5 |' @, g" j% M* r7 c
why 86...5.39.217.760 K! B5 v6 d: I2 H2 Y" {+ X, y
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21; N7 @; O6 S/ M9 B% Q# b' R
then he giv bck his fren 50
6 ~4 N- e0 n7 dand the shoes cost is 15公仔箱論壇# @! P ]7 E% S1 |) l% s
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so total he loss is 86...
' `$ Z# X. w$ P$ X- r$ M公仔箱論壇+ b$ F. M5 ?1 {- e8 q
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |