Need some help with this question, thank you

3~ (20'points) You are looking to borrow $20,000 right now. You are expecting to have an Inheritance (\ a an established trust) after five years. which you can use to repay the loan. You estimate that you will be able to repay $4.000 two years from now, and another $4.000 two years later. The lender is willing to lend the money at 16% annual interest. (a) (10 points) How much will you still owe after making the second payment? (b) (10 points) You are not quite sure about making the first payment of $4.000 after two years. You are discussing your financial situation with the lender. The lender says that they can offer the loan for the above amount at 15% annual rate if you are going to make one payment of $8,000 at the end of year 4. Which option would you opt for? Explain why