An investment project has annual cash inflows of $7,800, $8,300, $8,800, and $9,800, and a discount rate of 18 percent. (Do not round intermediate calculations. Round the final answers to 2 decimal places.) a. What is the discounted payback period for these cash flows if the initial cost is $12,000? Discounted payback period years b. What is the discounted payback period for these cash flows if the initial cost is $14,000? Discounted payback period years c. What is the discounted payback period for these cash flows if the initial cost is $20,000? Discounted payback period years