prozzy

the answer is -$97 for sure. ( E) Q3 q( G4 I) ^3 S3 W- |8 o
Think about it this way
5 Q8 J; L! L0 y公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇) C2 F0 [" D) t4 V( j! t1 U
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