An investment project provides cash inflows of $950 per year for eight years. a. What is the project payback period if the initial cost is $3,450 ? (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 $4,500 ? (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 $8,600 ? (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.)