21+50+15=86
0 v* u. i2 J( U2 J! o$ M0 D5.39.217.76why 86...
+ q- g3 m( o+ n1 {$ w Y- Tbecos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
6 |' E8 b% n0 H! a/ l' N公仔箱論壇then he giv bck his fren 50
" C) _. `! `& ` N3 Xand the shoes cost is 15
3 ~! ^8 O7 o/ M, [0 L5.39.217.76公仔箱論壇* z& Q, z! ^- ]# A- e8 @
so total he loss is 86...
: ^" c5 S) Z- |& R. K9 x公仔箱論壇
* v% @0 U P4 w$ i) k0 Y[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |