please explain in excel

23 An investment project has annual cash inflows of $2,800, $3,700, $5,100, and $4,300, for the next four years, respectively. The discount rate is 9 percent. 0 points a. What is the discounted payback period for these cash flows if the initial cost is $5,200? (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 $6,400? (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 $10,400? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) Print years a. Discounted payback period b. Discounted payback period c. Discounted payback period years years