In: Finance
24-4
What is the present value of a $16 million pool of 30-year mortgages with an 8.5 percent per year monthly mortgage coupon if market rates are 5 percent? The GNMA guarantee fee is 6 basis points and the FI servicing fee is 44 basis points. |
a. |
Assume that the GNMA pass-through is fully amortized. (Enter your answer in dollars not in millions. Do not round intermediate calculations. Round your answer to the nearest dollar amount.) |
Present value | $ |
b. |
Assume that the GNMA pass-through is only partially amortized. Market rates are still 5 percent. If there is a lump sum payment at the maturity of the GNMA pass-through that equals 50 percent of the mortgage pool's face value, find the present value of the pass-through. (Enter your answer in dollars not in millions. Do not round intermediate calculations. Round your answer to the nearest dollar amount.) |
Present value |
$ |
a. | Assume that the GNMA is fully amortized. | |
There are 360 monthly payments (30 years x 12 months). The GNMA monthly coupon rate is 8.5% ? .5% = 8 percent per annum, and the monthly GNMA pass?through payment is: $16m= PVAn=360, k=0.6667%*R | ||
PVA = (1-(1/(1+r)^n)/r | ||
1-(1/(1.006667^360))/0.006667 | ||
16000000 = 163.2783*R | ||
R = 16000000/163.2783 | ||
97992.20105 | ||
Present Value = $97992.20 | ||
The present value of the GNMA at a 5 percent market rate is | ||
PV = 97992.20*PVAn=180, k=0.004167% = | ||
PVA = (1-(1/(1+r)^n)/r | ||
1-(1/(1.00004167^360))/0.00004167 | ||
PV = 97992.20*357.31 | ||
35013592.98 | ||
$35,013,592.98 | ||
b | If GNMA is only half amortised | |
If there is a 50 percent amortization, the monthly GNMA pass?through payments are: | ||
$16m = R*PVAn=360, k=0.6667% + 8m*PVn=360, k=0.6667% Þ R = $81,115.94 | ||
$16m = R*163.2783 + 8m*0.9934 | ||
$16m = 163.2783R + 0.7315 | ||
(16-0.7315)/163.2783 = R | ||
R = $ 93512.12 | ||
The present value of the GNMA at a 5 percent market rate is: | ||
PV = $93,512.12*PVA n=360, k=0.004167% + 8m*PVn=360, k=0.004167% | ||
93512.12*357.31 + 8000000*0.9851 | ||
$41,293,615.60 | ||