quantitative problem: 5 years ago, barton industries issued 25-year noncallable, semiannual bonds 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. round your answer to two decimal places.