21+50+15=86tvb now,tvbnow,bttvb* v% s/ [6 @! q" V- W* {
why 86...( J, D5 s: T, A, j4 X
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21www2.tvboxnow.com0 g% ]2 e7 F7 p6 l# r+ h$ t
then he giv bck his fren 50
( S7 F o# X& F) v, o* d/ Fand the shoes cost is 15
4 p9 o8 j; V+ T6 q# V公仔箱論壇
; `: N6 S( f% O7 U/ }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。5 I! X2 J0 B- O; a+ i. B% E0 q% c
. S) P1 S- |. @6 y3 \tvb now,tvbnow,bttvb[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |