21+50+15=86% i8 O5 L5 d$ x
why 86...
7 J; z( i3 r5 ]$ O mos.tvboxnow.combecos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21) i% t: X) n- j1 o+ \2 Z
then he giv bck his fren 50公仔箱論壇8 ~: K1 ?8 d& Z; o; G2 p
and the shoes cost is 15
) N3 z1 _! J, b: STVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。公仔箱論壇5 M4 j( G9 Y2 c1 A/ I
so total he loss is 86...7 s' g8 ]8 ]: c0 ]
8 u6 ]6 }4 N* |' l
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |