Adjusted WACC. Lewis runs an outdoor adventure company and wants to know what effect a tax change will have on his company's WACC. Currently, Lewis has the following financing pattern: Equity: 29% and cost of 15.15% Preferred stock: 16% and cost of 11.63% Debt: 55% and cost of 10.2% before taxes What is the adjusted WACC for Lewis if the tax rate is a. 40% ? b. 25% ? c. 15% ? d. 5% ? e. 0%