Consider a firm with $88.80 in outstanding debt and $147.13 in equity. If the required retum on debt is 3.887%, the required return on equity is 6.351%, and the firm's tax rate is 27%, find the firm's weighted-average cost of capital to four decimal places. Assume no preferred stock is issued. For example, 4.56 for 4.56%, not 0.04 or 0.0456