21+50+15=86
2 ]/ O( W7 O U% Qwhy 86...公仔箱論壇4 V4 g+ Y! ^" V+ O; j$ p
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 217 @+ J" C- L" Y5 L
then he giv bck his fren 50
2 [5 P1 V" ?* X4 e1 N5 Z& v. ^and the shoes cost is 15公仔箱論壇# ~- e9 ~9 i8 f! R `! n! N
5.39.217.77, ^8 l) N) _. h" Q0 `* o
so total he loss is 86...5.39.217.77% Z$ z& ^* [0 o* m
/ ^0 M0 k# s5 ^! G公仔箱論壇[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |