the answer is -$97 for sure. 1 R6 c3 O8 e' w
Think about it this way
' _- p1 O5 Q3 K$ j/ ?2 ?# `1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
) m, [* I: d( s+ Y% n" A( z6 O2) 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 |