the answer is -$97 for sure.
. Q" w. o4 E8 r1 D. {/ ~" _os.tvboxnow.comThink about it this way tvb now,tvbnow,bttvb/ x# J6 ]* B! G% v( b; X+ N
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)os.tvboxnow.com# B8 o4 G2 `2 _. i
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 |