原帖由 prozzy 於 2007-5-18 23:05 發表。 + J/ F' b+ l, D
the answer is -$97 for sure. - }1 m2 ~% {1 v) U5 C
Think about it this way & B- P: d t/ ^6 n3 c' K- o' [
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)2 e8 i8 D" K- U" Z
2) Now, the owner discovered that the 100 bucks is fake. You can th ... : p5 f8 C3 u( K" R2 L5.39.217.76
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0 {4 B! g, R9 u2 p& |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。1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
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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.
9 J2 f3 f g6 _5 I公仔箱論壇 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。3 B4 \& c0 h/ J; [
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |