Given a pool of 30 year fully-amortizing FRMs making monthly payments to investors with the following characteristics: WAC: 6% Pass-through rate: 5.5% Prepayment assumption: 200 PSA Loans were not seasoned before entering pool This MBS has been active for a few years in collecting payments from borrowers and making payments to investors. It's currently month 26 in the pool.(t=26) Starting pool balance month in month 26: 72,534,232 What is the starting pool balance for month 27 of this security? (Hint: N=360 when t=1, N=359 when t=2, N=358 when t=3....etc)