You were hired as a consultant to GMC Company, whose target capital structure is $25\%$ debt, $15\%$ preferred, and $60\%$ common equity. The interest rate on new debt is $6\mathrm{.}00\%,$ the retained earnings is $14\mathrm{.}00\%,$ and the tax rate is $30\%.$ The firm will not be issuing any new stock. What is GMC$\text{'}$s weighted average cost of capital $($WAtC$()?$