solve a and b

Avicorp has a $14.6 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