( 1 point) Fifteen years ago a couple purchased a house for $140,000.00 by paying a 20% down payment and financing the remaining balance with a 30 year mortgage at 7.1% compounded monthly. (a) Find the monthly payment for this loan. Monthly Payment: \$ (b) Find the balance of the loan after 19 years and after 20 years. Let m be how many payments are left on the loan. (c) Find the total amount of interest paid by the couple during the 20th year. Interest Paid During 20th year: \$