原帖由 prozzy 於 2007-5-18 23:05 發表。 4 O' K' d8 t( ~, B& V1 w; [! ?$ D# J9 N
the answer is -$97 for sure. - }# N5 _1 F. O0 Z
Think about it this way
$ {; g$ g7 P7 w# _1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)os.tvboxnow.com8 f- E$ M' p3 ` A
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇' ]% r4 J' A* L5 J$ T3 v
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+ z* H% k0 C8 M4 S1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong) d4 k. L' w( w2 E
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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. |