the answer is -$97 for sure. . }" j& F. M3 _$ e; {+ ~0 G, V5 e
Think about it this way
. e2 ?8 E7 K* N. X2 ]1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
' V# R% Y0 u' b9 p: F5.39.217.762) 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 |