21+50+15=86
! q; l" D B4 _) q) Rtvb now,tvbnow,bttvbwhy 86...
7 i! r- T- [. V! T4 U$ E) J( vtvb now,tvbnow,bttvbbecos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21公仔箱論壇, X' u& h5 Q' ?3 M1 H9 Q% x& {' [2 S
then he giv bck his fren 50
0 }9 t& R6 C. ^' z6 X4 v/ A公仔箱論壇and the shoes cost is 15公仔箱論壇 f5 C5 N; \. J3 [5 S
. B9 e) x" a! g. f Lso total he loss is 86...
/ A. |! b& A/ y公仔箱論壇公仔箱論壇; V3 C: _" M8 u. T( y
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |