Problem $4$

The British Spitfire has an elliptic wing with an aspect ratio of $5\mathrm{.}4.$ If $C_L=0\mathrm{.}4,K=0\mathrm{.}25,$ and

$C_{D,\text{m}\text{i}\text{n}}=0\mathrm{.}04,$ what is the total $C_D?$