21+50+15=86tvb now,tvbnow,bttvb# @0 }3 S2 r' {; k [
why 86...& ^, a8 a" X" O* {& s
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 217 S3 p2 S% N$ C$ _
then he giv bck his fren 50
) s, B# R& E3 z; _and the shoes cost is 15公仔箱論壇- ^! n0 y! ^' q* C1 k3 {& f
tvb now,tvbnow,bttvb F7 i% }0 v' ^4 M
so total he loss is 86...www3.tvboxnow.com6 X) P' n9 |( q8 m; g6 L+ W
tvb now,tvbnow,bttvb: {- ~) Q6 M& Q6 ]- p4 B; I
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |