Lucky Cement is trying to establish its optimal capital structure. Its current capital structure consists of 20% debt and 80% equity; however, the CEO believes that the firm should use more debt. The risk-free rate, rRF, is 5%; the market risk premium, RPM, is 6%; and the firms tax rate is 40%. Currently, Lucky Cement has beta of 1.5. What would be Lucky Cements estimated cost of equity if it changed its capital structure to 40% debt and 60% equity? Should the company opt new capital structure? (decide based on the cost of equity computations)?