原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇: p( O; \, s# ^& `
the answer is -$97 for sure. 公仔箱論壇5 }/ G% ^ ]1 N
Think about it this way
6 |. J2 S) m# e0 t$ {/ Y/ wtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 v y2 i5 B: L. I# v" }; f0 R公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... : N7 M' u8 q8 E* mtvb now,tvbnow,bttvb8 X% C# P- n a8 u+ p |
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.76( ?, B" T5 C0 u0 W' ?
tvb now,tvbnow,bttvb( N; J* C: [: r8 n/ C' v
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.
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- X& {7 K& _+ t; K( Q+ J! Z/ @, ?tvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |