6. A 10-year $1,000 par value bond has 6 years remaining until maturity. The bond has an annual coupon rate of 4%. Coupons are paid semi-annually. The current price of the bond is $984.28. d) The Yield to Maturity is the firm's pre-cost cost of debt. Assume the company that issued the bonds has a tax rate of 21%. If this is the only debt that the company has outstanding, what is the company's after-tax cost of debt