原帖由 prozzy 於 2007-5-18 23:05 發表。 tvb now,tvbnow,bttvb* d4 g* [$ b- y& I# L
the answer is -$97 for sure. 公仔箱論壇3 L4 s" F( B: X5 R2 H
Think about it this way
0 Q; X$ k, w% D2 M9 }+ x1 D9 ?公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 l" F+ w0 v+ V# p @) c9 ktvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.77:88985 T# v# B0 K' |6 \* l/ Z0 L' [
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb H9 q$ x6 x; ^6 W6 z9 g9 B; z
公仔箱論壇8 K9 f3 {6 f% L- @5 f
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. |