the answer is -$97 for sure. 1 q- c. C$ C# k" B$ D' H: K) i, t
Think about it this way / j) q+ p9 c+ _5 }
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇5 B$ X$ S. x) [3 _1 J
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 |
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