Final answer:
Janet is paying an interest rate of 4.032% on her car loan.
Step-by-step explanation:
To find the interest rate Janet is paying on the car loan, we can use the formula for calculating the monthly payments on a loan:
- Divide the monthly payment ($420) by the loan amount ($12,500) to find the monthly interest rate.
- Convert the monthly interest rate into an annual interest rate by multiplying by 12.
- Finally, convert the annual interest rate into a percentage.
By following these steps, we can determine that Janet is paying an interest rate of 4.032% on her car loan.