the answer is -$97 for sure.
4 B6 h3 u+ U3 |7 _, `Think about it this way
+ j. T8 c, _ Rtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 w1 Y( X3 @# x7 j; p$ F公仔箱論壇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 |