Daniel and Jan agreed to pay $561,000 for a four-bedroom colonial home in Waltham, Massachusetts, with a $70,000 down payment. They have a 25 -year montgage at a fixed rate of 683%. (Use Table 151.) a. How much is their monthly payment? Note: Do not round intermediate calculations. Round your answer to the nearest cent. b. After the first payment, what would be the balance of the principal? Note: Do not round intermediate calculations. Round your answers to the nearest cent. Amortization table (mortgage principal and interest per $1,000 )