21+50+15=86# Y& U. i2 ~# m. F( Q' K; c$ h
why 86...5.39.217.765 f; F5 z/ n; m2 V5 s
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
% L0 C( r) }, z% {% D公仔箱論壇then he giv bck his fren 50
$ o+ ^5 Y/ ?! i2 y+ rtvb now,tvbnow,bttvband the shoes cost is 15
, X# P8 q9 \3 l6 O* Z: J公仔箱論壇. c; `& H3 |% f' G; E/ d% q3 ~0 c
so total he loss is 86...
! X- l. n. M( {* `3 l公仔箱論壇. I2 v. D; p& S! h
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |