4. (10 points) Great Eats has compiled the following financial data: Source of Capital Book Value Market Value Cost Long-term debt Preferred stock Common stock equity $12,000,000 $14,400,000 3,000,000 3,600,000 10,000,000 18,000,000 7.0% 13.0 17.0 $25,000,000 $36,000,000 a. Calculate the weighted average cost of capital using book value weights. b. Calculate the weighted average cost of capital using market value weights