原帖由 prozzy 於 2007-5-18 23:05 發表。 
Y& ~3 ?3 a. o; Tthe answer is -$97 for sure. tvb now,tvbnow,bttvb. C5 \: A+ O: r) ~- v
Think about it this way 5.39.217.77:8898! ~$ [1 H1 v! o! v& g. O1 d
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18), K6 D S/ y& A: \* a
2) Now, the owner discovered that the 100 bucks is fake. You can th ... : |7 i# K* a2 ^6 n' V公仔箱論壇9 B# u$ |# n7 m- Y
tvb now,tvbnow,bttvb! P& z* F) T* o u7 ^! e9 i @. p0 p
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.77:8898; [; x3 I; ]+ P! t
公仔箱論壇$ i( l! O# K3 {! _ X
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. |