21+50+15=869 {) {+ D6 c. B" y8 G& b4 c
why 86...
. }& t# h6 L4 x1 Q9 x: R公仔箱論壇becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21os.tvboxnow.com& D$ s N$ |. \* `$ ?
then he giv bck his fren 50os.tvboxnow.com) K! Q$ n1 G8 r1 E u1 ?/ S( B% i, s
and the shoes cost is 15
# x1 q! f" R" j ]( J$ D公仔箱論壇
4 e8 C2 u( v7 C& H1 n; r; X& _* |8 \+ yso total he loss is 86...) n( J9 e+ B6 c6 ]0 h4 A7 N% b
, `; j$ h. [- [, G' [- t% z' q[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |