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the answer is -$97 for sure. 5.39.217.76! m8 [0 A  F1 Q8 x
Think about it this way
, \# v. ^, N% z0 `1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
6 L! u$ H" i0 d" {: s* ~公仔箱論壇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