prozzy

the answer is -$97 for sure. ( b4 B( B1 p- G  z# z& r
Think about it this way 5.39.217.77: H+ V' V& W! E  v( q* z1 [" }+ G
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)/ S8 m- ]9 e  B" F& p
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