21+50+15=86tvb now,tvbnow,bttvb# ~: T' N5 b2 }/ d% B, X- s
why 86...
0 a) K% H' H5 sbecos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21tvb now,tvbnow,bttvb$ o( V1 q% \- h' d
then he giv bck his fren 50
4 U. U8 x7 w: V4 k6 \6 dand the shoes cost is 15
9 {+ p q' _' n- a k0 J: K% _
! {3 i; @7 { m7 {8 x, U! l/ i& j# {so total he loss is 86...公仔箱論壇1 l. s6 d1 Q5 }, K
3 u+ t7 C$ M4 q0 A公仔箱論壇[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |