原帖由 prozzy 於 2007-5-18 23:05 發表。 8 \6 t( c& L' l5 x: R' _/ M: k
the answer is -$97 for sure.
7 s" |2 A/ S) B3 T5.39.217.76Think about it this way
% A" C7 d5 R* T! D: ^ t' |- K1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb1 ~4 Q/ b1 Z4 O- I
2) Now, the owner discovered that the 100 bucks is fake. You can th ... & [( x% v# x. f. g) `8 etvb now,tvbnow,bttvb
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1 S: V9 P [; Q9 j; i) j1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong2 H5 v$ j+ j0 @ o$ \# A( }8 T
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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. |