21+50+15=86: r* l/ l9 @: D% j* F: k
why 86...公仔箱論壇" X2 B) p8 p( v3 v: G& N
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 215.39.217.76. w& |: P' @# ?
then he giv bck his fren 505.39.217.76. {* M) Z" q+ L
and the shoes cost is 157 Q f. K/ T1 T5 M C% p$ Q3 @
( A& y7 S6 |# R) J9 ?TVBNOW 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。so total he loss is 86... # a# t" [! P: i0 }6 ^5.39.217.76 1 E1 L; A$ h. U: p( O4 ]3 \ J6 k[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ]