Review this situation: Transworld Consortium Corp. is trying to identify its optimal capital structure. Transworld Consortium Corp. has gathered the following financial information to help with the analysis. 7.00% Debt Ratio Equity Ratio 30% 70% 40% 60% 50% 50% 60% 40% Is WACC 10.50% 8.61% 10.80% 8.21% 11.40% 8.01% 7.20% 7.70% 8.90% 12.20% 8.08% 70% 30% 10.30% 13.50% 8.38% Which capital structure shown in the preceding table is Transworld Consortium Corp.'s optimal capital structure? Debt ratio = 40%; equity ratio = 60% Debt ratio = 50%; equity ratio = 50% Debt ratio = 60%; equity ratio = 40% Debt ratio = 70%; equity ratio = 30% Debt ratio = 30%; equity ratio = 70% Consider this case: Globex Corp. has a capital structure that consists of 30% debt and 70% equity. The firm's current beta is 1.15, but management wants to understand Globex Corp.'s market risk without the effect of leverage. If Globex Corp. has a 45% tax rate, what is its unlevered beta