i tried the answer 50 too

Stuational Software CO. (SSC) is trying to establish its optimal capital structure. Its current capital structure consists of 35% debt and 65% equity; however, the CEO believes that the firm should use more debt. The risk-free rate, raF, is 5%; the market risk premium, RPM, is 6%; and the firm's tax rate is 40%. Currently, SSC's cost of equity is 13%, which is determined by the CAPM, What would be SSC's estimated cost of equity if it changed its capital structure to 50% debt and 50% equity? Do not round intermediate calculations, Round your answer to two decimal places