ABC Company has publicly traded $1,000 par value, 6% semiannual coupon bonds which mature in 18 years. These bonds have a current market price of $915. The company also has preferred stock with a $70 par and 6% annual dividend. The market has priced the preferred stock at $89. ABC's common stock has a beta of 1.5. You estimate the risk-free rate to be 3% and the required return on the market to be 14%. The company's average tax rate is 34%.
What is this company's after-tax cost of debt?