The optimal debt to assets ratio for Ogle Overfand Express is belleved to be $37\%.$ If 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 if the marginal income tax rate were $39\%?$