You plan to purchase a $120,000 house using a 15-year mortgage obtained from your local credit union. The mortgage rate offered to you is 5.5 percent. You will make a down payment of 10 percent of the purchase price. Calculate your monthly payments on this mortgage. Monthly payment $ Calculate the amount of interest and, separately, principal paid in the 140th payment. Amount of interest $ Amount of principal $ Calculate the amount of interest and. separately, principal paid in the 110th payment. Amount of interest $ Amount of principal $ Calculate the amount of interest paid over the life of this mortgage Amount of interest paid $