What is the IRR, assuming an industrial building can be purchased for $$250,000$ and is expected to yield cash flows of $$18,000$ for each of the next five years and be sold at the end of the fifth year for $$280,000?($Round your answer to two decimal places. If you calculate IRR as $11\mathrm{.}56\%,$ report it as $11\mathrm{.}56)$