21+50+15=86
, B; O8 O# m; h; \6 owww2.tvboxnow.comwhy 86...公仔箱論壇) @- [ g. }9 [
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21+ w( n3 ^; A; N
then he giv bck his fren 50
( T+ `' x, j$ D6 z; a- S( J4 Kwww2.tvboxnow.comand the shoes cost is 15公仔箱論壇+ q9 S! W1 s* }& Z' a
0 F% U3 e: _1 h# {( h$ `. D- U" Nso total he loss is 86...) F; P& i# y) f% ]# n2 y F' c k& L
www2.tvboxnow.com+ V3 i$ }/ q1 Y
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |