the answer is -$97 for sure. % G4 Q9 ?5 c7 j/ C3 T
Think about it this way 公仔箱論壇& {5 y+ {. }2 F( {
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)2 T. v5 k- c H
2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |
發表於 2007-5-16 03:12 AM
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發表於 2007-5-21 03:49 AM
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