21+50+15=86
9 Q7 r; u* Y, ^% ~9 Z# mwhy 86...) G% D) r! }3 e8 c9 Z
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21tvb now,tvbnow,bttvb: U- R$ a3 Y* g( @6 V6 z; I9 y
then he giv bck his fren 50
$ i0 L! l8 ^' p. l3 A) d: A- Atvb now,tvbnow,bttvband the shoes cost is 15
' ~2 e$ W' o$ {3 m* v+ f6 s/ H公仔箱論壇公仔箱論壇; l. {+ X4 T6 w: V
so total he loss is 86...
! E. p$ ~# J! g9 l( g. B9 J1 |os.tvboxnow.com3 |3 j; x8 S! l/ D
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |