A firm has only two funding sources, debt and equity. Their percentage of debt is $58\%,$ their tax rate is $21\mathrm{.}6\%,$ and their pretax cost of debt is $3\mathrm{.}05\%.$ If the required return on their equity is $10\mathrm{.}39\%,$ then what is their weighted average cost of capital? State your answer as a percentage with two decimal places $($i$.$e$.,13\mathrm{.}21,$ not $\mathrm{.}1321).$