Edible Egg Farms has bonds outstanding with $3\mathrm{.}5\%$ semiannual coupon rate with a yield to maturity of $8\%.$ The bond matures in $15$ years. The firm incurs flotation costs of $$9$ for flotation and $$4$ for administration costs. What is the bond's cost of debt if the firm is in the $40\%$ tax bracket?