原帖由 prozzy 於 2007-5-18 23:05 發表。  - C" @: Q% g* A; J
the answer is -$97 for sure.
7 ` ^/ R) G1 S3 Q& S+ X2 H公仔箱論壇Think about it this way
! Z; q5 w3 k P& ?* C3 z8 S- ?5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
+ c' l0 e1 ]1 j公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ...
公仔箱論壇% g$ e4 o& O! J2 T' |6 w3 D
6 c6 K* t% N8 @: w. a! E3 H8 sTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。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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think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.) N% \7 ^/ C6 Q ~
* l$ t2 {, s& A8 }公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |
發表於 2007-7-10 05:18 PM
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發表於 2007-7-11 03:19 PM
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