please answer these two questions in detail

Problem 2 (10 points) Compute the after-tax cost of debt for a 15-year, 12 percent coupon rate, $1,000 par value bond, and selling at $950. The tax rate is 21 percent. Problem 3 (10 points) A firm has issued preferred stock at its $125 per share par value. The stock will pay a $15 annual dividend. Compute the cost of the preferred stock