An investment project provides cash inflows of $970 per year for eight years. (Enter O when there is no payback period. Round the answers to 2 decimal places.) a. What is the project payback period if the initial cost is $4,100? Payback period years b. What is the project payback period if the initial cost is $6,200? Payback period years c. What is the project payback period if the initial cost is $8,000? Payback period years