Keyspan corp. is planning to issue debt that will mature in 2,030. In many respects, the issue is similar to the currently outstanding debt of the corporation.

a. Calculate the yield to maturity on similarly outstanding debt for the firm, in terms of maturity. (Input your answer as a percent rounded to 2 decimal places.) Assume that because the new debt wil be issued at par, the required yield to maturity will be .10 percent higher than the value determined in part a.

b. What is the new yield to maturity? (Do not round intermediate calculations. Input your answer as a percent rounded to 2 decimal places.)

c. If the firm is in a 35 percent tax bracket, what is the aftertax cost of debt for the yield determined in part b? (Do not round intermediate calculations. Input your answer as a percent rounded to 2 decimal places.)