An investment project provides cash inflows of $660 per year for eight years. What is the project payback period if the initial cost is $1,825? (Do not round intermediate calculations. Enter O if the project never pays back. Round your answer to 2 decimal places, e.g., 32.16.) Payback period 2.77 years What is the project payback period if the initial cost is $3,550? (Do not round intermediate calculations. Enter O if the project never pays back. Round your answer to 2 decimal places, e.g., 32.16.) Payback period 5.38 years What is the project payback period if the initial cost is $5,400? (Do not round intermediate calculations. Enter O if the project never pays back. Round your answer to 2 decimal places, e.g., 32.16.) Payback period 8.18 x years