An investment project provides cash inflows of $735 per year for eight years. What is the project payback period if the initial cost is $1,950? What is the project payback period if the initial cost is $3,800? What is the project payback period if the initial cost is $5,900? (Enter 0 if the project never pays back. Round your answer to 2 decimal places, e.g., 32.16.)