An investment project has annual cash inflows of $3,600, $4,500, $5,700, and $4,900, 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 $6,300? (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 $8,400? (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 $11,400? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) a. Discounted payback period years b. Discounted payback period years c. Discounted payback period years