the answer is -$97 for sure. * k3 G- M' s) k' r) c. P) y
Think about it this way
* B" Z9 ^" p4 h2 p! e0 s& B! r7 c' ~5.39.217.771) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)# ~: B P1 d/ b0 V4 C: j
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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