The market values and after-tax costs of various sources of capital used by Ridge Tool are shown in the following table: WACC-Market value weights a. Calculate the firm's weighted average cost of capital. b. Explain how the firm can use this cost in the investment decision-making process. . (Round to two decimal places.) a. The firm's weighted average cost of capital, ra, using market value weights is Data Table (Click on the icon located on the top-right corner of the data table below in order to copy its contents into a spreadsheet.) Source of capital Market value Individual cost Long-term debt Preferred stock $950,000 6.5% $60,000 9.4% Common stock equity $600.000 14.2% Print Done Enter your answer in the answer box and then click Check