Sensitivity of Class PO to Prepayments Assumed Price 78.07403% PSA Prepayment Assumption Rates 100% 270% 300% 550% 2.3% 4.4% 4.8% 7.8% Sensitivity of Class SA to Prepayments Assumed Price 101.05689%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 8.0% 7.9% 7.9% 7.8% 5.2375% .................................... 4.5% 4.4% 4.4% 4.3% 6.2375% .................................... 1.0% 1.0% 0.9% 0.9% 6.5500% and above ................    (0.1)% (0.1)% (0.1)% (0.2)% Sensitivity of Class SB to Prepayments Assumed Price 110.90669%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 9.9% 9.0% 8.9% 7.7% 5.2375% .................................... 5.2% 4.4% 4.3% 3.2% 6.2375% .................................... 0.6% (0.2)% (0.3)% (1.4)% 6.5500% and above ................    (0.8)% (1.6)% (1.7)% (2.8)% Sensitivity of Class SC to Prepayments Assumed Price 109.26506%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 9.6% 8.9% 8.7% 7.8% 5.2375% .................................... 5.1% 4.4% 4.3% 3.3% 6.2375% .................................... 0.7% 0.0% (0.1)% (1.0)% 6.5500% and above ................    (0.7)% (1.3)% (1.5)% (2.4)% Sensitivity of Class SG to Prepayments Assumed Price 102.69853%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 8.4% 8.1% 8.1% 7.8% 5.2375% .................................... 4.6% 4.4% 4.4% 4.1% 6.2375% .................................... 0.9% 0.8% 0.7% 0.5% 6.5500% and above ................    (0.2)% (0.4)% (0.4)% (0.7)% * The price does not include accrued interest. Accrued interest has been added to the price in calculating the yields set forth in the table. S-40