can you please explain with details and mention the formulas you have used

Suppose stock in Watta Corporation has a beta of 80 . The market risk premium is 6%, and the risk-free rate is 6%. Watta's last dividend was $1.20 per share, and the dividend is expected to grow at 8% indefinitely. The stock currently sells for $45 per share. Suppose also that Watta has a target debt-equity ratio of 50%. Its cost of debt is 9% before taxes. If the tax rate is 21% I a. What is Watta's cost of equity capital? b. What is the WACC