Sixx AM Manufacturing has a target debt$$equity ratio of $3.$ Its cost of equity is $0\mathrm{.}12,$ and its pretax cost of debt is $0\mathrm{.}05.$ If the tax rate is $0\mathrm{.}21,$ what is the company's WACC? Enter the answer with $4$ decimals $($e$.$g$.0\mathrm{.}0123)$