The answer I got was for (a) was $13431, but it was incorrect.

A friend of yours just bought a new sports car with a $5,500 down payment, and her $27,000 car loan is financed at an interest rate of 0.25% per month for 48 months. After 2 years, the Blue Book value of her vehicle in the used-car marketplace is $12,000. a. How much does your friend still owe on the car loan immediately after she makes her 24th payment? b. Compare your answer to Part (a) to $12,000. This situation is called being upside down. What can she do about it