the answer is -$97 for sure. " h1 ` J2 Q/ G' g3 M
Think about it this way
9 v/ e; Y/ f. S/ @0 [公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
0 o7 Z9 h4 _1 W' @) ?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 |