the answer is -$97 for sure.
* Y/ ^ W( q" B- M! Q! i5 W) G; P5.39.217.77Think about it this way
' l$ e+ x( @1 T( A: n0 a1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇1 c0 \8 a- `9 {' X- q* g/ @: t# }& {
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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