You have been presented with an investment opportunity which will yield cash flows of $30,000 per year in Years 1 through 8, and $35,000 per year in Years 9 and 10. This investment will cost the firm $150,000 today, and the firm's cost of capital is 10 percent. What is the payback period for this investment?

4 years

5 years

6 years

10 years

The investment does not pay back