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atrached 5 questions that i need to be answered with steps please . thank you

Q. II. Calculate the Cost of Debt Capital 1. If the average yield to maturity on a company's bond is 8 percent and the company's tax rate is 30 percent, Find the firm's after-tax cost of debt. 2. Yield to maturity on a company's bond is 5 percent and the company's tax rate is 15 percent, Find the firm's after-tax cost of debt. 3.Average yield to maturity on a company's bond is 10 percent and the company's tax rate is 25 percent, Find the firm's after-tax cost of debt. 4. Yield to maturity on a company's bond is 7 percent and the company's tax rate is 27 percent, Find the firm's after-tax cost of debt. 5. If the average yield to maturity on a company's bond is 6 percent and the company's tax rate is 40 percent, Find the firm's after-tax cost of debt