the answer is -$97 for sure. tvboxnow.com( ~+ ]# K" [ R5 @" z
Think about it this way 公仔箱論壇8 ^3 X6 ^% q" E; } C; n
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
) ? H% h. t4 `& Y" ]& r! \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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