原帖由 prozzy 於 2007-5-18 23:05 發表。 . _$ m- v; C3 z
the answer is -$97 for sure.
6 }0 `1 i3 ^' s( l/ E: y# RThink about it this way
4 T& ]1 ~9 q( F- \8 N- Ctvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb' z4 {9 ]: Y, y. G3 `
2) Now, the owner discovered that the 100 bucks is fake. You can th ... * N6 D3 c$ W8 }/ n
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# g9 P p. A0 f/ C8 C8 }+ [& [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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; X' O0 Z; |' v4 j2 @- ?9 othink 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.
# {2 V& x3 Z/ U: X* [" Y% V 5.39.217.76/ O# j: V, e. I: k
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |