1.- You are going to buy a house worth $120,000. And, you decide to borrow the money from bank with a 30-year term-at-a-9% (APR) variable rate and the interest rate can be changed every five years. (40%) (a.) What is the initial monthly payment? (b.)- If-the-lander' s interest rate is 9.75% (APR) at the end of five years, what will the monthly payment be? (C.)- At the end of the eighth year, what will the remaining balance be? (d.)-If the lander' s interest rate is 8% (APR) at the end of 10th years, and remains the same for the last 20 years, what will the total interest be