21+50+15=86tvb now,tvbnow,bttvb, D# P% Q3 R$ L# ^/ M3 B
why 86...
; r: h6 k" A8 |( _8 ^& m5.39.217.76becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 215.39.217.76. ?7 r( S) @* d6 |2 M! X1 }
then he giv bck his fren 50
% m0 c9 K. ~' b% sand the shoes cost is 15
% B# X1 @' J! y6 D7 u9 a
& k3 Q0 w/ k1 |% iso total he loss is 86...
. c0 P2 B$ Z& c" }5.39.217.76
. t" I5 `2 y4 N( J! Q( g[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |