An investment project has annual cash inflows of $4,500, $3,800, $5,000, and $4,200, for the next four years, respectively. The discount rate is 15 percent. a. What is the discounted payback period for these cash flows if the initial cost is $5,600? (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 $7,700? (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 $10,700? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)