You plan to purchase a $175,000 house using a 15 year mortgage obtained from a local bank. The mortgage rate offered to you is 7.75%. You will make a down payment of 20% of the purchase price. If the monthly payments of the mortgage are $1,317.79:

A) Calculate the amount of interest and, separately, principal paid in the 60^th payment.

B) Calculate the amount of interest and, separately, principal paid in the 180^th payment.

C) Calculate the amount of interest paid over the life of the mortgage.