21+50+15=86公仔箱論壇# I4 d2 u' c, K/ A# w8 I: u8 Z
why 86...
' a: _. j2 n& T8 H: _公仔箱論壇becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21tvb now,tvbnow,bttvb# @+ w- @9 K8 J# ?5 H3 z% W" g
then he giv bck his fren 50
" k& Q0 S$ P) H Q8 J' L5 z公仔箱論壇and the shoes cost is 15
4 y$ T7 b9 h, T; b+ [6 ^9 vtvb now,tvbnow,bttvb
) K" m) `+ `8 T3 wso total he loss is 86...5.39.217.76& w# n. m; u5 {2 `3 l$ c* Q
3 t( n- j/ ]+ H, e$ _[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |