solve this problem and show all formulas and calculations no financial calculator or excel allowed

PackMan Corporation has semiannual bonds outstanding with nine years to maturity and the bonds are currently priced at $754.08. If the bonds have a coupon rate of 7.25 percent, what is the after-tax cost of debt for PackMan if its marginal tax rate is 30 percent? (Round your Intermediate calculation to two decimal places.) 8.225% 7.050% 11.750% 12.095 %