1. Find the SMM for month 20 for PSA 325 and PSA 80.

2. Calculate the figures for columns 3 through 9 for month 4 from Exhibit 8-4 in customized text and Exhibit 11-4 in the regular text book

Exhibit 11-4 Monthly Cash Flow for a $400 Million 7.5% Pass-Through Rate with a WAC of 8.125% and a WAM of 357 Months Assuming 165 PSA (1) (2) (3) (4) (8) (9) Total Cash Flow Month SMM Outstanding Balance 400,000,000 399,290,077 398,468,181 397,534,621 396,489,799 2 0.00111 0.00139 0.00167 0.00195 0.00223 Mortgage Payment 2,975,868 2,972,575 2,968,456 2,963,513 2,957,747 Scheduled Principal 267,535 269,048 270,495 Interest 2,500,000 2,495,563 2,490,426 2,484,591 2,478,061 Prepayment 442,389 552,847 663,065 772,949 882,405 991 341 Total Principal 709,923 821,896 933,560 1,044,822 1,155,586 1265 759 3,209,923 3,317,459 3,423,986 3,529,413 3,633,647 3.736 598 271,873 273,181 6 395 334 213 000251 2951.160 2470 839 274 418 Exhibit 11-4 Monthly Cash Flow for a $400 Million 7.5% Pass-Through Rate with a WAC of 8.125% and a WAM of 357 Months Assuming 165 PSA (1) (2) (3) (4) (8) (9) Total Cash Flow Month SMM Outstanding Balance 400,000,000 399,290,077 398,468,181 397,534,621 396,489,799 2 0.00111 0.00139 0.00167 0.00195 0.00223 Mortgage Payment 2,975,868 2,972,575 2,968,456 2,963,513 2,957,747 Scheduled Principal 267,535 269,048 270,495 Interest 2,500,000 2,495,563 2,490,426 2,484,591 2,478,061 Prepayment 442,389 552,847 663,065 772,949 882,405 991 341 Total Principal 709,923 821,896 933,560 1,044,822 1,155,586 1265 759 3,209,923 3,317,459 3,423,986 3,529,413 3,633,647 3.736 598 271,873 273,181 6 395 334 213 000251 2951.160 2470 839 274 418