原帖由 prozzy 於 2007-5-18 23:05 發表。 
' F X+ k0 D7 t0 o& Ktvb now,tvbnow,bttvbthe answer is -$97 for sure. 5.39.217.761 S) @7 S+ }4 y# z2 ~ ?! L; e
Think about it this way
. j; E8 F" h D& E/ v5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
, ^- J; L+ |8 R# p; A) R公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.764 J( W5 h2 U$ ^0 P& j
5.39.217.761 C$ @8 A# y$ l# e m% S' Z1 d2 Y
. ?) l' n1 j; E' ?# N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
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& c4 I4 |+ F" R9 F5.39.217.76think 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.) Z8 |5 [6 k8 Q& k0 Q
3 t! O' D2 P8 ~4 _& Xtvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |