Starbuck's current capital structure (based on market value of the bond and stock outstanding) is 70% debt and 30% equity.The common stock is reported to have a beta of 1.50 if you search on Google and the company's tax rate is 40%. The President thinks the company is too risk because it has too much debt, and he asks the VP of Finance to consider the impact of moving to a capital structure with 35% debt and 65% equity. The current risk-free rate is 4.0% and the market risk premium is 5.0%. By how much would the firm's cost of equity change as a result of altering its capital structure?(i.e., what's the cost of equity when the firm is at 70% debt, what's the cost of equity will be when the firm is at 35% debt, and so what is the difference)

You must show all calculation steps, providing a final answer only will not get you full marks.