The Visadrone Surveillance Technologies, Inc. management has been told by their investment banker that the firm could issue new bonds at par with a coupon rate of 9%. Each of the new bonds would have a face value of $1,000, pay interest once per year, and would have an initial maturity of 20 years. The investment banks would charge flotation costs (F) of 2%. If the firm's marginal tax rate is 21%, what is the firm's after-tax cost of bond debt implied by this information? (Be sure to round your answer to the same number of decimal places as the answer options.)