Please solve step by step all the sections that need to be answered in the question.

(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 12 percent, and the bonds would mature in 18 years. If the company is in a 35 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.)