b) What is the value of this pass-through at 7% discount rate, assuming that there is prepayment with the prepayment rates below? Assume prepayment rate: 0.5% of the mortgage pool for the 1st year, 1% for the 2nd year, and 1.25% for the remaining years Calculate the answer by filling in the columns below. Year Beginning balance Mortgage Interest payment payment Principal Pre- payment payment payment Fee Payment to Ending investors balance B 5