Seattle corporation has been presented with investment opportunity which will yield cashflow $30000 per year in years 1 through 4. $35000 per year in years 5 through 9 & $40,000 in year 10. This investment will cost the firm $200000 today and the firms required rate of return is 10%. Assume cashflows occur evenly throughout the year 1/365th each day. What is the payback period for this investment?