A firm recently issued $1,000 par value, 15-year bonds with a coupon rate of 9%. Coupon interest payments will be paid semi-annually. The bonds sold at par value, but the firm paid flotation costs amounting to 5% of par value. The firm has a marginal tax rate of 3%. What is the firm's after-tax cost of debt for these bonds? O 5.85% 0 4.82% O 9.0% O 6.36% 09.64%