VEC Inc currently has $3,220,000$ zero coupon bonds outstanding, each with a face value of $$1000.$ The bonds have a maturity of $4$ years and they are traded in the market at $87\%$ of par. If the tax rate is $28\%$ what is the after tax cost of debt capital. the answer is $2\mathrm{.}55\%$ please show how they got this answer step by step