Calculating WACC for ABC Corporation

ABC Corporation is evaluating its overall cost of capital to assess its investment strategy. The firm has a debt-to-equity ratio of 60%. The cost of equity is estimated at 10%, and the after-tax cost of debt is 4%. ABC Corporation's total debt is $600,000 and total equity is $400,000. Based on this information, what is ABC Corporation's weighted average cost of capital (WACC)?