the answer is -$97 for sure.
6 p* G3 X; v+ _Think about it this way tvb now,tvbnow,bttvb+ W9 N$ `5 S: P9 a @# y) Q
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)$ |% c% l0 d/ \' {8 \; K
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 2007-5-19 03:21 PM
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發表於 2007-5-21 03:49 AM
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