原帖由 prozzy 於 2007-5-18 23:05 發表。 / x- B& Q' D' y( |5 ~
the answer is -$97 for sure. ) z# M: @& ^& D0 X8 J, y9 N
Think about it this way
+ j: V/ V/ {2 b2 w公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)) H+ @ t0 s8 B% ?* y( M+ \4 i
2) Now, the owner discovered that the 100 bucks is fake. You can th ... . }# w& q+ n4 O6 G& b. v
tvb now,tvbnow,bttvb, ]( _# M: U# d+ N- I& A7 d
3 J7 ~4 Y7 `+ ?6 i9 {7 \5 Q. w8 u5 qtvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb- _% R0 w9 N- W
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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.tvb now,tvbnow,bttvb- W4 |% `3 _! f8 V( c
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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. |