A. Butcher Timber Company hired your consulting firm to help them estimate the cost of equity. The yield on the firm's bonds is 8.00%, and your firm's cconomists believe that the cost of equity can be estimated using a risk premium of 5.62% over a firm's own cost of debt. What is an estimate of the firm's cost of equity from retained earming? a. 12.85% b. 13,62% C. 13.24% d. 15.16\% c. 10.28%