using excel answer this:

Two of your friends are considering buying a house with you after graduation. You can get a 15-year fixed-rate mortgage with a mortgage rate of 6% if you can pay at least a 20% down payment. You will split the monthly mortgage payment equally among the three of you. Each of you can afford to contribute up to $750 per month towards the mortgage payment. You each will pay $12,000 on the down payment. How expensive a house can you afford?