the answer is -$97 for sure. tvb now,tvbnow,bttvb# T* l, [7 @1 n6 E2 |* P
Think about it this way 公仔箱論壇& { M( j3 G0 G+ G7 v, Y
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)1 D! L0 I N5 d" C; Q/ q( f
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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