Carmen Construction Co. is in the 30 percent average tax bracket. A. Calculate the after-tax (WACC) for the company. B. Show how the company's WACC would change if the interest rate on debt drops to 8.5%. the tax rate drops to 25 percent and the estimated cost of equity capital is based on a risk-free rate of 4 percent, a market risk premium of 7 percent, and a systematic risk measure or beta of 2.5 . C. Explain anv changes you observe