21+50+15=86
; f. [8 I# G* U4 x, m7 rwhy 86...公仔箱論壇- T) N& [' L- D+ V7 C
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21tvb now,tvbnow,bttvb; D0 G' N1 w; y4 i3 g. P' m/ V
then he giv bck his fren 50
4 Z4 F3 o. X8 ^) \5.39.217.76and the shoes cost is 15tvb now,tvbnow,bttvb2 }# L/ s$ t) u+ S
6 ]/ _+ y, Y( l! `0 c
so total he loss is 86...) B& n' x4 c6 Z& g% e
* H/ ?; m, X J
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |