What are the payback periods?

An investment project provides cash inflows of $1, 400 per year for eight years. (Enter 0 if the project never pays back. Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) What is the project payback period if the initial cost is $4, 350? Payback period years What is the project payback period if the initial cost is $5, 400? Payback period years What is the project payback period if the initial cost is $12, 200? Payback period years