please help with all three of these!! i am struggling

thank you

Problem 5-4 Calculating Discounted Payback An investment project costs $10,000 and has annual cash flows of $2,830 for six years. a. What is the discounted payback period if the discount rate is 0 percent? (Enter 0 if the project never pays back on a discounted payback basis. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) b. What is the discounted payback period if the discount rate is 4 percent? (Enter 0 if the project never pays back on a discounted payback basis. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) c. What is the discounted payback period if the discount rate is 21 percent? (Enter 0 if the project never pays back on a discounted payback basis. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)