21+50+15=86* E! c g! I' _+ g2 L/ l
why 86... $ X* E) b% H& g* @" R5 Y! X' n: k1 e公仔箱論壇becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 218 t- q; L# G8 y9 N/ m
then he giv bck his fren 509 [+ W: L$ U& G8 h M
and the shoes cost is 15 N5 V9 X' [) W) x1 dTVBNOW 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。 # _: X* x. N S0 v5.39.217.76so total he loss is 86...公仔箱論壇! z1 w% |* k1 k0 T: C
2 m7 i G' X/ k. f7 o" J[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ]