If Dagmar decides to pay off her loan, her payoff amount (in dollars) is $29,081.20.
The payoff amount equals the future value of the car loan after making 28 payments of $975.77.
This future value can be computed using an online finance calculator as follows:
N (# of periods) = 28 months
I/Y (Interest per year) = 5.5%
PV (Present Value) = $0
PMT (Periodic Payment) = $975.77
Results:
FV (Future Value) = $29,081.20
The sum of all periodic payments = $27,321.56
Total Interest = $1,759.64
Thus, to pay off the loan, Dagmar must pay $29,081.20 after the 28th monthly payment.