prozzy

the answer is -$97 for sure. - |* a% @  g( Q# `! z# s& p
Think about it this way
9 y1 p6 H) f# X- }! n5.39.217.77:88981) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.77:88980 k6 N' p$ O! S0 U. ~; e
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