21+50+15=86
* O- e& b1 ?9 R3 `6 Z5 @www1.tvboxnow.comwhy 86...
5 p3 `9 M( ~1 f" ~* N# Ubecos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
- t* ]/ ~ H; Nthen he giv bck his fren 50
1 f' `& F+ ?5 x7 e+ P7 B, o" Zand the shoes cost is 15公仔箱論壇- _5 j9 { w% t) b/ ?, n. _
6 p( Y/ O8 W% R7 {; D2 u. Z% D6 P
so total he loss is 86...4 k. A8 W) M( [3 K0 U. N5 d* d
% S+ S+ ?0 z1 a( _: ~9 J. W3 d
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |