(1 point) Mr. Smith is purchasing a $ 140000 house. The down payment is 20 % of the price of the house. He is given the choice of two mortgages: a) a 20-year mortgage at a rate of 8 %. Find () the monthly payment:$ (i) the total amount of interest paid:$ b) a 15-year mortgage at a rate of 8 %. Find (1) The monthly payment:$ (i) the total amount of interest paid: $