the answer is -$97 for sure.
, m4 W$ I# g3 P: JThink about it this way
* J, T6 h# T% m% @9 `1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)www.tvboxnow.com9 I: [( Q% O) X; r' j$ d
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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