An 8.0 coupon bond issued by the state of Indiana sells for $1,000. What coupon rate on a corporate bond selling at its $1,000 par valse would produce the same after-tax return to the investor as the municipal bond if the investor is in a the 15% marginal tax bracket? Do not round intermediate calculations. Round your answer to two decimal places o the 25% marginal tex bracket? Do not round Intermediate calculations. Round your answer to two decimal places c. the 28% marginal tax bracket? Do not round Intermediate calculations. Round your answer to two decimal places