Mary and Fred are purchasing a home for $250,000. They can afford to put 20% down on the home, but need a mortgage for the remainder. You will need to consult an online mortgage calculator for this problem, such as at Bankrate.com a) How much is the down payment? b) How much money do they need to borrow? c) using a Mortgage Calculator, if they borrow this money at 4.5% interest for 15 years, what will their monthly payment be? d) How much total interest will they pay? e) If they change the loan to a 30 year loan at 4% interest, what is their monthly payment? f) What is the total amount of interest they will pay?