The Green Mortgage Company has originated a pool containing 75 ten-year fixed interest rate mortgages with an average balance of$100,200 each. All mortgages in the pool carry a coupon of 12 percent. (For simplicity, assume that all mortgage payments are madeannually at 12% interest.) Green would now like to sell the pool to FNMA.Required:a. Assuming a constant annual prepayment rate of 10 percent (for simplicity, assume that prepayments are based on the pool balanceat the end of each year), what will be the price that Green should obtain on the date of issuance if market interest rates were (1) 11percent? (2) 12 percent? (3) 9 percent?b. Assume that five years have passed since he date in (a). What will the pool factor be? If market interest rates are 12 percent, whatprice can Green obtain then?c. Instead of selling the pool of mortgages in (a). Green decides to securitize the mortgages by issuing 100 pass-through securities.The coupon rate will be 11.5 percent and the servicing and guarantee fee will be 0.5 percent. However, the current market rate ofreturn is now 9.5 percent. How much will Green obtain for this offering of MPTs? What will each purchaser pay for an MPT security.assuming the same prepayment rate as in (a)?d. Assume now that immediately after purchase in (c), Interest rates fall to 8 percent and that the prepayment rates are expected toaccelerate to 20 percent per year, beginning at the end of the first year. What will the MPT security be worth now?I got question a) I need help with b c and d

Required A Required B Required C Required D Assuming a constant annual prepayment rate of 10 percent (for simplicity, assume that prepayments are based on the pool balance at the end of each year), what will be the price that Green should obtain on the date of issuance if market interest rates were (1) 11 percent? (2) 12 percent? (3) 9 percent? (Do not round intermediate calculations, Round your final answers to the nearest whole dollar,) Market Interest Price of the Pool Rate 11% $ 7,756,079 12% $ 7,515,000 9% $ 8,280,623