the answer is -$97 for sure. 5.39.217.768 v2 s! F o1 h* X* z
Think about it this way 0 v. W- u3 l' Z( c$ K! b0 ^1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18) / J/ F/ H' [; u3 }# P2 r3 t2) 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