原帖由 prozzy 於 2007-5-18 23:05 發表。  , S, w; P( V: t2 a% E
the answer is -$97 for sure.
4 R. F" C' v. G" Wtvb now,tvbnow,bttvbThink about it this way : v" I, f6 i7 u
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)$ A! a. Q$ K4 f" d; c e2 C% z
2) Now, the owner discovered that the 100 bucks is fake. You can th ...
9 A3 R' Z" `$ X I' v# |tvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
/ w% m# }4 |! e+ a# Q公仔箱論壇 tvb now,tvbnow,bttvb& X" u7 t0 p$ }1 W1 L# [
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.& ~9 [/ A2 m/ o" j8 }
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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. |
發表於 2007-4-9 06:27 PM
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