WACClong dash Book weightsRidge Tool has on its books the amounts and specific (after-tax) costs shown in the following table for each source of capital: LOADING... . a. Calculate the firm's weighted average cost of capital using book value weights. Source of capital Book value Individual cost Long-term debt $950 comma 000 7.9 % Preferred stock $30 comma 000 11.8 % Common stock equity $400 comma 000 15.1%