prozzy

the answer is -$97 for sure.
; O; A' U8 f) i" y2 \2 g% W. Xtvb now,tvbnow,bttvbThink about it this way
4 e+ x6 n- _; g/ stvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)) S' S$ B6 p; q1 \) i: 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