the answer is -$97 for sure.
# Q- u- l2 q: t$ l, J1 i3 [% o5.39.217.76Think about it this way
4 y* k4 z0 P0 I( l1 @' l6 e# }1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb. e1 `, O" C- _. I* Z
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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