The Habbertone Company is considering investing in a wind turbine to generate its own power. Any unused power will be sold back to the local utility company. Between cost savings and new revenues, the company expects to generate net cash inflows of \($750,000\) per year from the turbine. The turbine would cost \($4\) million and is expected to have a 20-year useful life with no residual value. Calculate the payback period.