The formula for amount is given by:

Now we are given ,
Principal (P) =$8500
rate (r) =3.9% = 0.039
period of interest (n) =1 for compounded annually
time (t) = 12 years
Plugging these values in the formula,

Amount =$13452.5773053
Answer : There will be $13452.5773053 in the account after 12 years.