原帖由 prozzy 於 2007-5-18 23:05 發表。 
2 B( [6 y0 k0 E: R5.39.217.76the answer is -$97 for sure.
9 R! \! C% y4 O- m8 {Think about it this way 5.39.217.76, R8 V5 t9 {6 C
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
/ J9 J8 T3 u/ h, b2) Now, the owner discovered that the 100 bucks is fake. You can th ... ' U: i1 p9 J+ h
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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 wrong
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: C: r) B" ]8 L# u公仔箱論壇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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" j/ {7 Q7 ~1 N8 s2 VI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |