21+50+15=86
) G1 w1 G2 R3 }4 d. @- y1 P) J2 V公仔箱論壇why 86...
4 x n1 h8 s+ r6 `2 D1 Y1 `3 C/ ] a ?becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21+ x* Q! v1 e( u- b6 v5 k, y4 l
then he giv bck his fren 50
; m' x3 }% Q' Gand the shoes cost is 15
1 d8 A: q# i+ }3 P- E$ I) ^5 z B公仔箱論壇& ?/ o8 D: m( g4 c8 L6 v2 d5 S; j/ h
so total he loss is 86...
5 V1 A1 ]' F$ q2 Etvb now,tvbnow,bttvb- c, l6 [3 m4 p* A& y
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |