ying import has several bond issues outstanding, each making semiannual interest payments. $1.6\mathrm{.}4\%,106\mathrm{.}36,6$ years, $44,000,000.2.7\mathrm{.}9\%,114\mathrm{.}92,9$ years, $39,000,000.3.7\mathrm{.}6\%,113\mathrm{.}47,16\mathrm{.}5$ years, $59,000,000.4.7\mathrm{.}2\%,102\mathrm{.}71,26$ years, $66,000,000.$ if the corporate tax rate is $24$ percent, what is the aftertax cost of the company's debt?