An investment project provides cash inflows of $1,000 per year for eight years. a. What is the project payback period if the initial cost is $3,550? (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) b. What is the project payback period if the initial cost is $4,600? (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) c. What is the project payback period if the initial cost is $9,000? (Enter O if the project never pays back. Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.)