the answer is -$97 for sure.
9 G) t h$ X2 ~- Y/ Y9 }' R, g" OThink about it this way
2 t/ ^1 o* F& H& p5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
9 _9 `- {* `2 b" R9 Otvb 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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