Great Lakes Packing has two bond issues outstanding. The first issue has a coupon rate of $3\mathrm{.}40$ percent, a par value of $$1,000$ per bond, matures in $3$ years, has a total face value of $$3\mathrm{.}1$ million, and is quoted at $104$ percent of face value. The second issue has a coupon rate of $5\mathrm{.}52$ percent, a par value of $$2,000$ per bond, matures in $16$ years, has a total face value of $$7\mathrm{.}4$ million, and is quoted at $97$ percent of face value. Both bonds pay interest semiannually. The company's tax rate is $35$ percent. What is the firm's weighted average aftertax cost of debt?