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the answer is -$97 for sure. 3 d1 O8 T. \! E6 X! D5 |( @
Think about it this way www3.tvboxnow.com4 N1 b5 s2 u' N1 {' l
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
6 N5 e) E6 W! _- [( }) l2) 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