the answer is -$97 for sure. - ?7 \0 c0 b+ d: r& K
Think about it this way
/ `8 E! d) i5 b7 m) Y0 o5 e1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18); R, o5 B- C& J8 B& I+ x
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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