原帖由 prozzy 於 2007-5-18 23:05 發表。 tvb now,tvbnow,bttvb( w e2 g3 }# i% W3 J+ i
the answer is -$97 for sure. 6 N4 k- h/ D C% g) q! O
Think about it this way 5 v0 p/ ~) ~7 ]+ |% ~
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
: ]8 { L: K4 ?7 JTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。2) Now, the owner discovered that the 100 bucks is fake. You can th ... 7 ^5 W9 t7 |2 }( k3 L$ w5 [
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4 n) I! f E3 F2 G# N. S1 ttvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong公仔箱論壇. P) Q5 z# d, u5 T" u6 X: g
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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.
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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |