原帖由 prozzy 於 2007-5-18 23:05 發表。 
5 y9 L. e: S$ K4 bthe answer is -$97 for sure. tvb now,tvbnow,bttvb% d& D: c8 D, f1 M7 V, w6 U% o
Think about it this way
# w! s" K7 `' v0 R/ D* X8 b1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.768 [) N; L, y& h
2) Now, the owner discovered that the 100 bucks is fake. You can th ... - H$ f3 q8 U" x7 Vtvb now,tvbnow,bttvb
/ v% \6 u5 |. Q9 CTVBNOW 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。 tvb now,tvbnow,bttvb1 R/ O' b0 @8 o! z
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.
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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. |