When you purchased your house, you took out a 30-year annual-payment mortgage with an interest rate of 8% per year. The annual payment on the mortgage is $15,989. You have just made a payment and have now decided to pay the mortgage off by repaying the outstanding balance. a. What is the payoff amount if you have lived in the house for 13 years (so there are 17 years left on the mortgage)? b. What is the payoff amount if you have lived in the house for 25 years (so there are 5 years left on the mortgage)? c. What is the payoff amount if you have lived in the house for 13 years (so there are 17 years left on the mortgage) and you decide to pay off the mortgage immediately before the 13 th payment is due?