the answer is -$97 for sure. 8 B. q! h6 L9 T
Think about it this way / W+ \* m. E- ?, ^: A4 B! l( X- J. `
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 Z0 N7 T( E# r" r ]& [tvb 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 |