(1 point) Fifteen years ago a couple purchased a house for $180,000.00 by paying a 20 % down payment and financing the remaining balance with a 30- year mortgage at 6.36% compounded monthly. (a) Find the monthly payment for this loan. Monthly Payment: [Note: Your answer is a dollar amount and should have a dollar sign and exactly two decimal places.] (b) Find the balance of the loan after 18 years and after 19 years? After 18 years After 19 years n = n = Loan Balance: Loan Balance: [Note: Your answer for each loan balance should be a dollar amount and should have a dollar sign and exactly two decimal places.] (c) Find the total amount of interest paid by the couple during the 19th year. Interest Paid During 19th year: [Note: Your answer is a dollar amount and should have a dollar sign and exactly two decimal places.]