21+50+15=86: a" ]+ Z, G$ n2 T
why 86...
j& F6 [- }7 e$ d5.39.217.76becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
8 {0 a2 {( ^) b V7 s) ?then he giv bck his fren 50公仔箱論壇# O- _+ t! ^2 N9 h* ]3 ]) m* T
and the shoes cost is 15
$ I# @" {3 F6 i* A% B# |" l, T/ y9 F) e8 `5 Z- c1 B4 B+ ?6 Y+ H- k
so total he loss is 86...TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。, G# x+ ~. h$ S) X
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[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |