The optimal debt to assets ratio for Ogle Overland Express is believed to be $37\%.$ Il this optimal capital structure is maintained, the before$-$tax cost of debt financing kd $($the interest rate Ogle would expect to pay new lenders$)$ should be $6\mathrm{.}625\%$ per year and the cost of common equity financing ke should be $11\mathrm{.}875\%$ annually $($Ogle does not use preferred stock financing$).$ If the company's marginal combined state$-$plus$-$federal income tax rate is $23\%.$ what is its weighted average cost of capital, KA or WACC?