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　　Under a 200% PSA model, what is the single monthly mortality (SMM) for, respectively, month 20 and month 40
　　A.      8% and 12%
　　B.      8% and 16%
　　C.      0.69% and 1.44%
　　D.      0.69% and 1.06%
　　Answer: D
　　The base PSA model assumes that prepayments begin at a rate of 0.2% CPR in the first month and increase at a rate of 0.2% CPR per month until they reach 6.0% CPR in month 30.