the answer is -$97 for sure.
8 v5 I W+ c& N! R2 a5.39.217.76Think about it this way tvb now,tvbnow,bttvb: a0 n& q8 T3 I
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 g0 @, [/ X& x: f. C1 Z3 l. I( X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 |