21+50+15=86" o7 c9 x3 m% ?
why 86... ) V% ]0 W! I, P, z7 N, m4 lTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21 . ^- o$ a* K8 S4 tthen he giv bck his fren 505.39.217.76/ ? t: C, ?( a8 k3 I
and the shoes cost is 15 + l% L0 T( [+ l" E/ t7 j, \- X1 w5.39.217.76. f6 v$ M: a! e) f2 Q* ]4 _
so total he loss is 86... K. }1 h3 k6 O+ }TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。& m2 s$ B' _6 ]! G. B3 R& v$ b( n
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ]