原帖由 prozzy 於 2007-5-18 23:05 發表。 
- t3 Q5 U/ {9 |7 Z7 h: t公仔箱論壇the answer is -$97 for sure. 5 q0 k2 [& j* k% A. ^9 [2 e
Think about it this way tvb now,tvbnow,bttvb3 e$ W+ e8 g3 j
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
9 m2 m$ r* Q8 v' A! l& B公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... www3.tvboxnow.com1 q) X4 B+ w) m
公仔箱論壇5 Q! C3 P# D5 _: f* }" q: ?
tvb now,tvbnow,bttvb# f1 }- I# A: |, i: q* U. n
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongwww3.tvboxnow.com& I0 q, ]6 E" G3 [
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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.公仔箱論壇; [+ w8 O) D/ J; k. F
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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. |