21+50+15=86公仔箱論壇/ ^% a2 j5 c c6 S8 J9 y
why 86...3 e" I8 o- C+ m6 f G, ], k1 @# I0 V
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 215.39.217.767 o T; z1 R6 G* r9 D& v
then he giv bck his fren 50
0 U, x" P Q6 C! I- F5.39.217.76and the shoes cost is 155.39.217.76* I. H' j/ |. W5 q* r' k) m9 e
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so total he loss is 86...8 g$ J# ?6 U: D0 `! ]3 S) c7 q
3 N" p4 M7 u7 R4 [# w. Z# b公仔箱論壇[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |