An investment project has annual cash inflows of $3,900, $4,800, $6,000, and $5,200, and a discount rate of 15 percent.

a. What is the discounted payback period for these cash flows if the initial cost is $6,600 (in years)? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)

b. What is the discounted payback period for these cash flows if the initial cost is $8,700 (in years)? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) c. What is the discounted payback period for these cash flows if the initial cost is $11,700 (in years)? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)