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estimate is 7.5 percent. 8.4 Richmond Clinic has obtained the following estimates for its costs of debt and equity at various capital structures: Debt (%) After-Tax Cost of Debt (%) O Cost of Equity (96) 16.0 17.0 19.0 20 6.6 7.8 40 60 10.2 22.0 80 14.0 27.0 Chapter 8: Business Financing and the cost of Capital 245 What is the firm's optimal capital structure? (Hint: Calculate its corporate cost of capital at each structure. Also, note that data on component costs at alternative capital structures are not reliable in real-world situations.) ntion ir ostimating its corporate A