Other Economic Applications 1. Given I(t)=9t}, find the level of capital formation in a) 6 years and b) for the years (interval [2, 6]. 2. You and your friends are trying to purchase a house together. The price of the house is $380,000. You will pay weekly (52 weeks per year. Find the weekly payment D if you will pay off the house in 20 year. The annual interest rate is 3%. You also have $ 40,000 as a downpayment. T _ Hint: Use fowDe rwtdt. Solve the general problem. TW= the number of weeks of mortgage duration. rw= the weekly interest rate