Quantitative Problem: 5 years ago, Barton Industries issued 25 -year noncallable, semiennual bends with a $1,000 face value and an 11% coupon, semiannual payment ( $55 payment every 6 months). The bonds currently sell for $844.87. If the firm's marginal tax rate is 25%, what is the firm's after-tax cost of debt? Do not round intermediate calculations. Plound your answer to two decimal places