21+50+15=86
) r# K2 `- l) z2 J" ~$ p: J& Nwhy 86...# r$ `9 F& ?! y9 W+ Z1 m1 R: |
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21tvb now,tvbnow,bttvb! p2 l2 j5 Z) \3 k7 M$ O& N
then he giv bck his fren 50
) `0 t( T( v5 x- G! D" l/ ~6 @' iand the shoes cost is 153 ]0 k6 H ]- \# q
$ r6 i% X" J: Z; G5 Q公仔箱論壇so total he loss is 86...
" Z& q+ ~5 l& v2 c6 T1 b2 Vtvb now,tvbnow,bttvb$ e* K3 C0 d0 |7 i
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |