Answer:
a. What is her monthly payment?

b. What is the total of all her monthly payments?

c. What is the total finance charge?

Explanation:
Loan amount = $8,000
APR =3.11% = 3.11/100 = 0.0311 as a decimal
Monthly interest rate in decimal = 0.0311/12 = 0.0026
Term of loan = 4 years = 4 x 12 = 48 months
Since Melissa makes payments monthly, her loan balance keeps decreasing
The formula for monthly payments on a loan of P at an annual interest rate of i per month for n months is given by the formula:

Here
P = $8,000
i = 0.0026
n = 48
So the monthly payment is:

This works out to
- Monthly payment = $177.50
(I presume you are allowed to use a financial calculator to solve this but you can also solve this manually using the equation above)
- Total of monthly payments
= $177.50 x 48 = $ 8520
- Total Finance Charge = 8250 - 8000 = $520