The Walgreen Corporation is contemplating a new investment that it plans to finance using one-third debt. The firm can sell new $1000 par value bonds with a 15 year maturity at a price of $946 that carry a coupon interest rate of 12.4 percent that is paid semiannually. If the company is in a 34 percent tax bracket, what is the after-tax cost of capital to Walgreen for the bonds?