An analyst has collected the following information about Green Corp.:

The companys cost of common stock, RE, is 14.00% The companys before-tax cost of debt, RD, is 8.00%. The companys cost of preferred stock, RP, is 7.50% The companys effective tax rate is 40% The companys current capital structure based on market values is 60% common equity, 10% preferred equity, and 30% debt.

A. Given these data, what is the firms weighted average cost of capital (WACC)?

B. The after-tax cost of debt for Green Corp. is _______%.