A homeowner is looking to buy a home in Marvin Gardens. The most he can afford to pay in total is $1,800 per month.

A homeowner is looking to buy a home in Marvin Gardens. The most he can afford to pay in total is $1,800 per month. Yearly property taxes will be about $3,000 (escrowed monthly) and insurance is $110 per month. There are no other costs. If mortgage rates are 6.25% for a 30-year fixed-rate mortgage, how large can his mortgage be? If his parents give him $20,000 for a down payment, what is the most he can pay on a house with a 15-year mortgage if the interest rate is 5.50%?