please answer all parts, they go together not separate questions

Laurel, Inc., has debt outstanding with a coupon rate of 5.9% and a yield to maturity of 6.8%. Its tax rate is 35%. What is Laurel's effective (after-tax) cost of debt? NOTE: Assume that the debt has annual coupons. Note: Assume that the firm will always be able to utilize its full interest tax shield. The effective after-tax cost of debt is \%. (Round to four decimal places.) HighGrowth Company has a stock price of $18. The firm will pay a dividend next year of $0.84, and its dividend is expected to grow at a rate of 4.2% per year thereafter. What is your estimate of HighGrowth's cost of equity capital? The required return (cost of capital) of levered equity is \%. (Round to one decimal place.)