21+50+15=86; G7 r5 D, W, Q% S
why 86...
4 k, ^" J! S9 ^* T- c7 A5.39.217.76becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
) S; u/ k: n* l3 H+ R/ A4 `/ Rthen he giv bck his fren 50# f; ~% n7 o( Q! p$ z
and the shoes cost is 15
8 w2 p7 c0 ~0 b5 O- l M5 w/ f) a% D3 Z
so total he loss is 86...5.39.217.76* W5 s' ~6 T3 g& w& H
4 R ^* M7 r" mtvb now,tvbnow,bttvb[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |