Cost of debt using both methods (ytm and the approximation formula) currently, warren industries can sell 15 dash year, $1 comma 000-par-value bonds paying annual interest at a 14% coupon rate. because current market rates for similar bonds are just under 14%, warren can sell its bonds for $990 each; warren will incur flotation costs of $30 per bond. the firm is in the 24% tax bracket. a. find the net proceeds from the sale of the bond, upper n subscript d. b. calculate the bond's yield to maturity (ytm) to estimate the before-tax and after-tax costs of debt. c. use the approximation formula to estimate the before-tax and after-tax costs of debt.