21+50+15=86tvboxnow.com0 g1 P& W' B: V0 r8 a
why 86...tvb now,tvbnow,bttvb3 R3 }+ M4 z' M, O/ M' K' A4 y
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
+ _/ Q& r/ I! L! o: Tthen he giv bck his fren 50. o" {0 O5 v) q8 T' d
and the shoes cost is 15
1 ~ p- a, T3 B) X" a" `) ^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。公仔箱論壇. d# G1 Q3 g0 _& d
so total he loss is 86...
/ F9 k) V8 s" V1 `公仔箱論壇
8 B4 w3 u3 h8 N! Xtvb now,tvbnow,bttvb[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |