原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇: b( M3 z/ t- ]- |4 w
the answer is -$97 for sure.
A- ~+ a7 X: G. a1 iThink about it this way + x! Q& T2 w) ?
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇( o4 ^" z$ X0 Q1 G& j4 ^/ Y6 N3 k
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 1 i; G2 r! o2 H& A! V" Q
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong6 k# Q6 G% z) M0 {% }! J( \
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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. |