company has a D/E ratio of 0.47 and a tax rate of 25%. They have no plans to change their capital structure. Their stock has consistently returned 8% for the past 5 years and has a Beta of 0.67 . The expected market return is 13%, while treasury securities yield 3\%. The company has BBB+-rated debt maturing in 5 years with a coupon rate of 6%. The debt pays semi-annual coupons and has a par value of $1000 and a market price of $900 per bond. What is this company's after-tax WACC