An investment project provides cash inflows of $690 per year for eight years. a. What is the project payback period if the initial cost is $1,475? (Enter 0 if the project never pays back. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) b. What is the project payback period if the initial cost is $3.500? (Enter O if the project never pays back. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) c. What is the project payback period If the initial cost is $5,700? (Enter O if the project never pays back. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) years a. Payback period b. Payback period c. Payback period years years