I need help with the problem that is shown below.

Kareem Construction Company has the following amounts of interest-bearing debt and common equity capital: Kareem Construction is in the 30 percent average tax bracket. A. Calculate the after-tax WACC for Kareem. B. Show how Kareem's WACC would change if the tax rate dropped to 25 percent and the estimated cost of equity capital were based on a risk-free rate of 7 percent, a market risk premium of 8 percent, and a systematic risk measure or beta of 2.0