The present value of an investment is estimated at about $$266,300.$ The expected generated free cash flow from the project for next year is $$5,000$ and is expected to grow $15\%$ a year for the next four years following the first generated cash flow. After the fifth year $($t$=5),$ the growth rate is expected to be $6\%$ in perpetuity. Estimate the discount rate used in valuing this project?