I would like to know how to solve this problem correctly please

Question 6 2.5/2.5 View Policies Show Attempt History Carla Vista Ltd. has issued bonds that never require the principal amount to be repaid to investors. Correspondingly. Carla Vista must make interest payments into the infinite future. If the bondholders receive annual payments of $87 and the current price of the bonds is $1,000.00 Your Answer Correct Answer Your answer is correct. What is the pre-tax cost of this debt? (Round answer to 2 decimal places, e.g. 15.25%.) Pre-tax cost of debt 8.70 % eTextbook and Media Your Answer Correct Answer Your answer is correct What is the after-tax cost of this debt for Carla Vista if the form is in the 40 percent marginal tax rate? (Round intermediate calculations to 4 decimal places, e.g. 1.2514 and final answer to 2 decimal places, e.g. 15.25%.) After-tax cost of debt 5.22% eTextbook and Media