a 30 -year fixed-rate mortgage at 7%. Complete parts (a) through (e) below. a. Find the required down payment. g b. Find the amount of the mortgage. c. How much must be paid for the three points at closing? ] (Round to the nearest dollar as needed.) d. Find the monthly payment (excluding escrowed taxes and insurance). (Round to the nearest dollar as needed.) e. Find the total cost of interest over 30 years. (Round to the nearest dollar as needed.)