原帖由 prozzy 於 2007-5-18 23:05 發表。 7 n' U, M5 G( d5 _
the answer is -$97 for sure.
' f. K% y& ^1 M6 {6 ^3 lThink about it this way
) K8 }, h4 R9 m1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇# V6 e: ^" W6 v1 T. L. R
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5 S5 ]3 I6 w0 p* M# l4 x
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5.39.217.762 R+ h4 \$ S# ~; M
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. |