Hilary, a manager of a family restaurant, is considering a renovation investment that would expand the operation's menu offerings. The project will have an initial cost of $36,000. Annual cash inflow from the project is expected to be $12,000 while cash outflow is expected to be $5,000 which will results in $7,000 annual net cash inflows for the next 8 years. What is the payback period in years for the proposed investment