Gamma Airlines is currently all-equity-financed, and its shares offer an expected return of 18 percent. The risk-free interest rate is 10 percent. Draw a graph with return on the vertical axis and debt–equity ratio (D/E) on the horizontal axis, and plot for different levels of leverage the expected return on assets (r_A), the expected return on equity (r_E ), and the return on debt (r_D). Assume that the debt is risk-free. Now draw a similar graph with the debt ratio (D/V) on the horizontal axis.