CPR = 6% × 23/30
CPR = 4.6%
Note: To calculate the CPR you needed to know that the CPR is based upon 6% and rises from 0.2 percent per month each month until month 30.
150 PSA = 1.5 × 4.6% = 6.9%
SMM = 1 − (1 − CPR)1/12
SMM = 1 − (1 − 0.069)1/12
SMM = 0.59%
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