21+50+15=86公仔箱論壇9 a4 O) R O6 N. Q& A% S6 A8 C( a& w
why 86...
6 e5 _0 j5 P( S K# R9 X' `8 TTVBNOW 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。becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21公仔箱論壇7 {: h( z8 L' ?8 S/ s
then he giv bck his fren 50
/ x' }+ M. m3 w+ x4 J3 ~$ qand the shoes cost is 15
) h& e, m* e& ~3 D+ x. E, o& j3 _) j/ f4 A
so total he loss is 86...公仔箱論壇: T% P2 ~3 X7 |7 Q( j
2 G3 z) z; W8 W; ], w5 I[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |
發表於 2008-11-28 06:21 PM
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按成本算是损失７３元．4 l8 N# U% z% S" {# }