Question: Using an options prepayment model, calculate the yield on the following fully amortizing MBS Term (yrs) 3 PV MBA $ 50,000,000 Coupon (%) 6.5% Market

Using an options prepayment model, calculate the yield on the following fully amortizing MBS Term (yrs) 3 PV MBA $ 50,000,000 Coupon (%) 6.5% Market Yield (%) 6.8% Assume no servicing or guarantee fee applies a. What is the annual payment on the GNMA passthrough? b. What is the present value of the GNMA passthrough?

c. Interest rates change + or - .5% per year and are equally likely If interest rates fall 1% below the current mortgage coupon rate all mortgages in the pool will prepay. Diagram the interest rate tree and indicate probabilities of each node in the tree

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