21+50+15=86
7 K- H; ^% P: T- [1 S3 fwhy 86... z3 ^' E9 Z- [7 I
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
: v7 Z: n" H) N; Ktvb now,tvbnow,bttvbthen he giv bck his fren 50
; K7 P+ L2 e1 B# g/ z9 Q5.39.217.77and the shoes cost is 155 ?9 S: m6 U; l7 }2 Z7 _- C
3 v9 d6 G! p. @4 V3 g2 ~
so total he loss is 86...
' ]6 H7 I3 c G1 q/ k
) n: g2 G" o; Y" \% M- g' P公仔箱論壇[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |