Cost of debt using both methods? (YTM and the approximation? formula) ?Currently, Warren Industries can sell 10 dash year ?, ?$1 000 ?-par-value bonds paying annual interest at a 15 ?% coupon rate. As a result of current interest? rates, the bonds can be sold for ?$1 comma 060 each before incurring flotation costs of ?$20 per bond. The firm is in the 30 ?% tax bracket.