the answer is -$97 for sure. 2 w2 H' }# P% f: k3 | l
Think about it this way os.tvboxnow.com8 B; B7 j- X( p0 z( {
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)( M# s2 D8 Z0 m% b& F
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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