the answer is -$97 for sure. ; Q3 X5 Q/ a- X. S
Think about it this way
$ r4 h' @, Z# ~2 j8 m \0 j1 p; Etvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
, l5 M5 C( u" W9 J, Z9 A2) 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 |