prozzy

the answer is -$97 for sure. 5.39.217.77:8898; U$ O  v' h1 D0 H
Think about it this way
' Q2 l. f. H/ i& ?, p: b1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.77:8898. u$ X  b5 X+ `7 z) D# k8 j
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