原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.765 K" s: N9 }0 \& \6 F2 p2 a4 S
the answer is -$97 for sure. 5.39.217.76! P7 e% ^1 _, ]( \
Think about it this way
# B9 p) c% u7 O D1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
$ o" e+ P* p( ltvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇4 q( Q% Y3 i- D
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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 wrongtvb now,tvbnow,bttvb _7 [" m9 R8 C( ^0 k! d& B9 h
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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.tvb now,tvbnow,bttvb8 o9 ~% [. f2 O& E! b+ n
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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. |