4. (15 points) You want to buy a computer system which costs $50,000. You plan to make a down payment of 20%. You have secured a bank loan at 4% APR. The loan must be paid up fully in 5 years through equal six-monthly payments. a. What will be your six-monthly payment? b. Prepare the amortization schedule for this loan. c. What is the total amount of interest paid on this loan? How much if any of this is interest on interest? d. How much interest you pay over the first five years? Compare this amount with the interest paid during the last five years