the answer is -$97 for sure. 公仔箱論壇' [% v) l) Q' I# N0 r: }! e# T
Think about it this way
% m: h( [+ c3 b2 ^4 Rtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)9 ]$ F' I1 A; J8 q0 K/ |+ X
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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