21+50+15=86
3 u- j4 i. B2 l& G5.39.217.77:8898why 86...
. \1 G& U3 ?+ ^8 H" M5.39.217.77:8898becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
Y7 \ C1 H: M$ X9 r1 L' V) @then he giv bck his fren 50
0 c8 P- j7 @; f1 s7 n8 kand the shoes cost is 15
A- W& Z. P; r- u8 Z* K- |. R& @5.39.217.77:8898, M, h( J( h( x
so total he loss is 86...
& C" \# i; `& v: Y公仔箱論壇
# m$ T* b9 d$ h- ^* U. ~' G- |tvb now,tvbnow,bttvb[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |