USA Manufacturing issued 30-year, 7.2 percent semiannual bonds 6 years ago. The bonds currently sell at 101 percent of face value. What is the firm's after-tax cost of debt if the tax rate is 21 percent?

Round to two digits and fill in the numbers ONLY. For example, 88.8888% would be rounded to 88.89%, and the answer would be 88.89 without the percentage symbol.