Appropriate after-tax cost of debt

[question removed by moderator]

How do you calculate yield to maturity on a comparable outstanding which is 7% using HP 12 C?

You don’t need to compute the yield in this question. It states that both bonds are priced at par , which is a scenario when coupon=yield.

You should remember/understand this rule:

Coupon=Yield, bond trades at par

Coupon>Yield, bond trades at premium


Thanks for the response!