21+50+15=867 f% [ u! z/ q* s5 b" _, h
why 86...$ p8 Z2 M0 k( f3 i
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21/ H n# F* O5 S* c) J. ~- K8 C
then he giv bck his fren 50
5 N7 L0 h. j* U8 N# M; Pand the shoes cost is 159 O# F7 R# w e' x
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。; ]3 {# k7 y( j: t
so total he loss is 86...tvb now,tvbnow,bttvb9 k; |) I3 `' P$ y6 L
+ d W( ~0 o1 i' w6 P% Z公仔箱論壇[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |