Please help me answer the following question parts a and b for the following question. Please only answer if you know how to solve it. Thank you

= Homework: Lab #3 Question 4, Problem 12-6 Part 1 of 2 HW Score: 85.71%, 24 of 28 points Points: 0 of 2 Save Avicorp has a $14.4 million debt issue outstanding, with a 5.8% coupon rate. The debt has semi-annual coupons, the next coupon is due in six months, and the debt matures in five years. It is currently priced at 96% of par value. a. What is Avicorp's pre-tax cost of debt? Note: Compute the effective annual return. b. If Avicorp faces a 40% tax rate, what is its after-tax cost of debt? Note: Assume that the firm will always be able to utilize its full interest tax shield. a. The cost of debt is % per year. (Round to four decimal places.)