21+50+15=86: L. X; O9 q" F, B* }
why 86...
) O. Q- X( D' `1 K+ q Ewww2.tvboxnow.combecos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21+ {% M K( Z6 ?. d: H& k
then he giv bck his fren 50
' A% r, V3 D" x3 ^$ nand the shoes cost is 15公仔箱論壇* c3 l# [% s& l/ d8 b/ P- j" u
1 J+ S3 L: F- G7 h; ^7 v8 ?4 cso total he loss is 86...
8 g L9 h+ b/ I- G) A O公仔箱論壇$ o# a% `1 x c# z( `5 ?
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |