An investment project has annual cash inflows of $4,200, $5,100, $6,300, and $5,500, for the next four years, respectively. The discount rate is 15 percent. What is the discounted payback period for these cash flows if the initial cost is $6,900? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) Discounted payback period years What is the discounted payback period for these cash flows if the initial cost is $9,000? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 3216) Discounted payback period years What is the discounted payback period for these cash flows if the initial cost is $12,000? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) Discounted payback period years