原帖由 prozzy 於 2007-5-18 23:05 發表。 8 M' ~$ x* S" \; d
the answer is -$97 for sure.
M# O# [! m9 ~) H' |Think about it this way
+ G# l( d4 L g+ t: |" N1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
# M+ H0 [9 e8 O/ k1 R5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。# V" l6 Q5 B/ c% x2 d! H
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% }" [0 B( Y# A# f1 G) itvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
k; p. R- `! F2 g0 {' x& S公仔箱論壇
1 z" w+ b; \) l7 k, zthink 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. |