the answer is -$97 for sure. os.tvboxnow.com0 I, J; q( D6 V
Think about it this way
' v: ]- G8 r6 B2 W1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
3 k4 ~6 W. | @* I1 atvb now,tvbnow,bttvb2) 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 |