原帖由 prozzy 於 2007-5-18 23:05 發表。 
0 h& v, p; s- l# s' Y0 Q$ O/ t; \the answer is -$97 for sure.
+ D7 }4 W" t2 t, S' c7 gTVBNOW 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。Think about it this way
3 b9 @) B' t* [0 I3 _- e5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76: z1 \$ H3 B+ B) z* \: V
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.76* d- Z. E1 T: t( g* ~! _9 v+ G
% X8 g2 k4 }; q9 `2 M' dtvb now,tvbnow,bttvb , ?' B7 B! N% ]9 ^! Y6 x: U1 l) R9 E
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
5 x5 J; K' } D) y5 Btvb now,tvbnow,bttvb 公仔箱論壇; u3 p% I' X$ _9 G; ?9 c
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。$ j! z4 z7 _9 c' b0 n4 P% k
* V9 R& Z1 z7 Q$ G/ J( I6 uI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |