Please don't use excel. If you are using a financial calculator with "PMT" buttons please let me know what button you pushed for each value. Please show all your work and answer each part of the question, I am trying to actually learn how to do this on my own so i need to see how you got the answer. Any correct answer that follows these guidelines will get a thumbs up.

The terms of a car loan are -cost is $ 37,000 and a down payment of $7,000 financed for 5 years at 3.9% compounded monthly.

How much of the 20th payment goes to interest? _______________