Suppose you want to start a business in three years, and you need a loan for four years once the business is created (for years 4, 5, 6, and 7). The bank has told you that the three-year rate is 7%, the four-year rate is 7.5%, and the seven-year rate is 8.5%. What is the rate in year 4, 5, 6, and 7, respectively?