the answer is -$97 for sure. tvboxnow.com# O! q$ S" G1 b6 b7 H* C7 W" M/ \+ x
Think about it this way 公仔箱論壇5 h. M5 \9 S& o5 l, [
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇1 M) t+ `8 _; C0 B$ 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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