21+50+15=86
! j2 R5 d2 x! l& {) E8 N; |公仔箱論壇why 86...5.39.217.77:88984 K& M- h2 t% k( b6 o
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 218 J; l. f* _2 R# e( t r% n3 y- w
then he giv bck his fren 50) o$ Q" d, _& {5 H1 ~+ ?; t
and the shoes cost is 15
( z6 c3 v, f ]6 m& Y公仔箱論壇8 o6 V0 ]6 k/ m5 l) H3 L1 Q) T5 K! H
so total he loss is 86...
7 S1 g9 X/ p( i* Q1 d" q$ ~tvb now,tvbnow,bttvbtvb now,tvbnow,bttvb3 E# d7 O8 q" x0 I- ]; y* Y1 j3 C
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |