the answer is -$97 for sure.
" n6 \+ e [5 A. K7 ?' v2 N3 T0 [9 HThink about it this way
" L8 o8 x0 C5 s8 q" D" D. Ltvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)7 b' g p3 b! y- ?
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 |