Sally decided to get a floating rate mortgage with interest only feature for the first five years and puts 20% down. She gets an introductory rate for a year at 1.25%. The loan has a spread of 3% over 1 year US Treasuries and comes with an annual cap of 2% and lifetime cap of 7.5%. The index in for adjustments in years 2,3,4,5, are 2.5%, 3.5%, 4.25% and 5.5%. How much interest will she pay over the first five years.