4. The Nutrex Corporation wants to calculate its weighted average cost of capital. Its desired capital structure weights are 40% long-term debt and 60% common equity. The before-tax cost of debt is 10% and Nutrex is in the 40% tax bracket. The current rate of interest is 8% on Treasury Bills. The expected return on Standard and Poor's 500 Index is 13% and the company's beta is 1.8