the answer is -$97 for sure. , U5 q+ k7 N. G: ]( A2 B: ?( f
Think about it this way tvboxnow.com5 L& s* k' H6 s6 }1 D
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
. p9 `9 j; e" u# ~tvb now,tvbnow,bttvb2) 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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