NUTERS is a publicly traded company. it has $200 million in long-term bank loan on its books, with a stated interest rate of %4 and $250 million in publicly traded bonds, with a coupon rate of 3.6%. the company currently has a bond rating of BBB, with a default spread of 2.5% over the risk free rate. if the current T.Bill rate is 1.5% the ten-year T.Bond rate is 4.0% and the marginal tax rate is 40%, what is the after-tax cost of debt?