Suppose a company currently has some bonds outstanding in the market. The bonds have 10 years until maturity, they pay a coupon rate of 6% on a semiannual basis. If the company’s bonds are selling for $965 now, and the company’s tax rate is 40%, what is its after-tax cost of debt? What is Pretax cost of debt? State Appropriate Mathematical formula to be used and detailed steps in the solution calculations.