21+50+15=86
, M8 p; }9 C* N5 i* V* Fwhy 86...
# \8 ~# ~) [5 r% C! S2 F; f$ ztvb now,tvbnow,bttvbbecos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
d$ b9 U/ j) p$ c/ e3 @" G公仔箱論壇then he giv bck his fren 50
/ I; I I+ J: R) e0 \公仔箱論壇and the shoes cost is 15公仔箱論壇7 u7 n# U2 Q/ E& q
5 V0 b0 W( q8 l0 Yso total he loss is 86...
2 u: T$ c( L8 a# O公仔箱論壇
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