I do not care about the answer, I am having trouble with the formula so please express the formula to me so that I can solve similar problems

5. Avicgir has a $10 million debt issue outstanding, with a 6% coupon rate. The debt has semiannual coupons, the next coupon is due in six months, and the debt matures in five years. It is currently priced at 95% of par value. What is Axicornis pretax cost of debt? b. If Avicoir faces a 40% tax rate, what is its after-tax cost of debt? a