A couple plans to purchase a house. The bank requires a 20% down payment on the $320,000 house. The couple will finance the rest of the cost with a fixed- rate mortgage at 6% annual interest with monthly payments over 30 years. Complete the parts below. Do not round any intermediate computations. Round your final answers to the nearest cent if necessary. If necessary, refer to the list of financial formulas. (a) Find the required down payment. $0 (b) Find the amount of the mortgage. $0 (c) Find the monthly payment. $0