21+50+15=86
( C8 P3 n9 G& \- W; c4 dwhy 86...公仔箱論壇6 _5 r8 |+ j- s2 L
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
: u- K+ E# Q: b! h5.39.217.77:8898then he giv bck his fren 50
6 l% ?. x- V, p5 {tvb now,tvbnow,bttvband the shoes cost is 15公仔箱論壇% P: O+ C' g. o l
5.39.217.77:8898! [* ?. Q3 e/ n" L# ]% v
so total he loss is 86...: H/ e) S; O7 W' Y9 f4 H" a' a/ y
6 p2 ], G" i I[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |