the answer is -$97 for sure.
' K$ h6 S8 ?/ Z* [8 Bwww3.tvboxnow.comThink about it this way tvb now,tvbnow,bttvb& z- \3 V' k, k3 I* T! [
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)www3.tvboxnow.com" O* H R9 a A6 F8 h7 |# R# f1 V. _
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 |