=+P9–5 The cost of debt Gronseth Drywall Systems Inc. is in discussions with its investment bankers regarding the issuance of new bonds. The investment banker has informed the firm that different maturities will carry different coupon rates and sell at different prices. The firm must choose among several alternatives. In each case, the bonds will have a $1,000 par value and flotation costs will be $30 per bond. The company is taxed at a rate of 21%. Calculate the after-tax cost of financing with each of the following alternatives.