The Seattle Corporation has been presented with an investment opportunity which will yield cash flows of $30,000 per year in Years 1 through 4, $50,000 per year in Years 5 through 9, and $50,000 in Year10. This investment will cost the firm $250,000 today, and the firm's required rate of return is 10 percent. Assume cash flows occur evenly during the year, 1/365th each day. What is the payback period for this investment? (show your work)