Ashton wants to buy a house for $400,000 • He is required to put10% down and finance the balance by taking a 15-year mortgage at an APR of 4.25%. What will be his monthly payment on that loan? (20 pts.) b) How much is the total amount that he will pay after 15 years including the down payment? (15 pts.) c) How much interest did he pay on the 15-year mortgage? (15 pts.) 2) Marissa wants to buy a house for $ with no down payment requires.