Suppose you take out a 20-year mortgage for a house that costs $276,696. Assume the following: The annual interest rate on the mortgage is 4%. The bank requires a minimum down payment of 10% at the time of the loan. The annual property tax is 1.5% of the cost of the house. The annual homeowner's insurance is 0.6% of the cost of the house. The monthly PMI is $77 Your other long-term debts require payments of $845 per month. If you make the minimum down payment, what is the minimum gross monthly salary you must earn in order to satisfy the 28% rule and the 36% rule simultaneously?