ann wants to buy a building. the annual noi for the building will be $100,000. she wants to get a 10 year interest only fixed rate mortgage at an annual rate of 5% with annual compounding and annual payments to buy the building. the lender has a minimum debt service coverage ratio (dscr) of 1.20. if ann gets a 50% ltv loan for $500,000, what is her dscr?