21+50+15=86
8 i( T* [! ?; Ewhy 86...9 [8 P8 F# D1 \4 E
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21tvb now,tvbnow,bttvb: b3 q2 A+ |+ T0 O8 Q# X: R, A
then he giv bck his fren 50公仔箱論壇0 o: }) v4 P+ J3 H3 G
and the shoes cost is 15, G, y( i1 B; _. K5 Q4 {
% e2 M8 M R" U! j1 _* b公仔箱論壇so total he loss is 86...5.39.217.76% O+ F5 b; b" k$ }. M8 k& q
( l" p; `) y6 T5.39.217.76[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |