Great Lakes Packing has two bond issues outstanding. The first issue has a coupon rate of $3\mathrm{.}72$ percent, a par value of $$2,000$ per bond, matures in $7$ years, has a total face value of $$4\mathrm{.}7$ million, and is quoted at $104$ percent of face value. The second issue has a coupon rate of $6\mathrm{.}49$ percent, a par value of $$1,000$ per bond, matures in $19$ years, has a total face value of $$9\mathrm{.}0$ million, and is quoted at $96$ percent of face value. Both bonds pay interest semiannually. The company's tax rate is $22$ percent. What is the firm's weighted average aftertax cost of debt?