Cartwright Communications is considering making a change to its capital structure to reduce its cost of capital and increase firm value. Right now, Cartwright has a capital structure that consists of 20% debt and 80% equity, based on market values. (Its D/S ratio is 0.25.) The risk-free rate is 6% and the market risk premium, r_M - r_RF, is 5%. Currently the company's cost of equity, which is based on the CAPM, is 12% and its tax rate is 40%. What would be Cartwright's estimated cost of equity if it were to change its capital structure to 50% debt and 50% equity? a. Find the firm's current levered beta using the CAPM: b. Find the firm's unlevered beta using the Hamada equation: c. Find the new levered beta given the new capital structure using the Hamada equation. d. Find the firm's new cost of equity given its new beta and the CAPM