HELP!

eBook Problem Walk-Through Situational Software Co. (SSC) is trying to establish its optimal capital structure. Its current capital structure consists of 40% debt and 60% equity; however, the CEO believes that the firm should use more debt. The risk-free rate, ref, is 4%; the market risk premium, RPM, is 5%; and the firm's tax rate is 25%. 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