Currently, the firm is all equity funded with 1000000 shares valued at $12 per share and the required return on equity is 9%. Income tax rate is 21%. Your banker has indicated that the following leverage restructurings are possible: Number of shares 750,000 600,000 500,000 Debt Leverage 25.00% 40.00% 50.00% Interest 6.50% 7.00% 7.50% ROE 9.50% 9.75% 10.25% Estimate which two debt restructures maximize firm value. 25%; 50% 0%; 25% 40%: 50% 25%, 40% 0%; 50%