(Cost of debt) The Zephyr Corporation is contemplating a new investment to be financed 33 percent from debt The firm could sell new \$1,000 par value bonds at a net price of \$970. The coupon interest rate is 8 percent, and the bonds would mature in 11 years. If the company is in a 40 percent tax bracket, what is the after-tax cost of capital to Zephyr for bonds? The after-tax cost of capital to Zephyr for bonds is \%. (Round to two decimal places.)