What is the Lifetime IRR for and investment in a project with an initial investment of $$500,000$ and cashflows at the end of years one to three of $$300,000,$ $$250,000,$ and $$200,000,$ respectively? $($Show your answer to four decimals. For example, $5\mathrm{.}6\%$ is shown as $0\mathrm{.}0560)$