原帖由 prozzy 於 2007-5-18 23:05 發表。  / J# n1 N$ `0 E
the answer is -$97 for sure.
! M7 J+ y& d! y% R, S8 M公仔箱論壇Think about it this way
1 l9 [& x k0 k- ?, f- rtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
/ s# G3 V. k, N3 |4 i4 h2 ]tvboxnow.com2) Now, the owner discovered that the 100 bucks is fake. You can th ...
tvb now,tvbnow,bttvb$ i5 \& O, y% ^7 t2 O9 A, C
8 w* ?+ }" c- c* Z% U3 [0 L公仔箱論壇1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
) ?. Z+ i! N1 T# M tvboxnow.com$ K+ u/ t. i9 Q, m; p( {
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.
* w& N9 w# T- x, Q" S公仔箱論壇 tvboxnow.com! w, d Y3 g3 O
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 2007-7-10 05:18 PM
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發表於 2007-7-11 03:19 PM
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