An investment project costs $16,000 and has annual cash flows of $4,300 for six years. What is the discounted payback period if the discount rate is zero percent? (Do not round intermediate calculations. Enter 0 if the project never pays back. Round your answer to 2 decimal places (e.g., 32.16).) Discounted payback period years What is the discounted payback period if the discount rate is 7 percent? (Do not round intermediate calculations. Enter 0 if the project never pays back. Round your answer to 2 decimal places (e.g., 32.16).) Discounted payback period years What is the discounted payback period if the discount rate is 21 percent? (Do not round intermediate calculations. Enter 0 if the project never pays back. Round your answer to 2 decimal places (e.g., 32.16).) Discounted payback period years