the answer is -$97 for sure. / n0 {0 J9 Z+ {2 n& L
Think about it this way
# `+ g: i7 d5 Q! a+ h% a0 F公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
1 r2 }2 C7 z4 A8 n: W6 }- \+ htvb 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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