21+50+15=86, R3 l$ o8 C9 w- `
why 86... j6 n% Y- Y# F& b) F# o
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
: b% V7 D: m4 f, A) |2 W* c! M+ h3 `公仔箱論壇then he giv bck his fren 50
% M2 [! f" E1 ? _" J2 d2 |; X* d公仔箱論壇and the shoes cost is 15
8 N. i, Z3 a: B3 }tvb now,tvbnow,bttvb: H. u; V+ W2 A& g3 m) a
so total he loss is 86...
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& o2 @& A2 V& Z) g2 l+ C( s[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |