Refinance Question Car Loan:

Two years ago, you purchased a $20,000 car, putting $4,000 down and borrowing the rest. Your loan was a 36-month fixed rate loan at a stated rate of 6.0% per year. You paid a non-refundable application fee of $100 at that time in cash. Interest rates have fallen during the last two years and a new bank now offers to refinance your car by lending you the balance due at a stated rate of 5.0% per year. You will use the proceeds of this loan to pay off the old loan. Suppose the new loan over the residual loan life requires a $200 non-refundable application fee. Given all this information, should you refinance? How much do you gain/lose if you do?

1. Yes, gain $30.32
2. No, lose $30.32
3. No, lose $169.68
4. Yes, gain $169.68

Can anyone explain how to do this question? I am not getting any of these answers when completing the questions.

Thanks!