i know the answer please just show me the steps (with HP 10Bii calc) in detail

3. A firm recently issued $1,000 par value, 20 year bonds with a coupon rate of 9%. Coupon interest payments will be a semi-annually. The bonds sold t a value, but the firm paid flotation costs amounting to 5% of par value. The firm has a tax rate of 21%. what is the firm's after-tax cost of debt for these bonds? a) 9.57% b) 7.56% c) 7.11% d) 7.74% e) 7.04%