Determine what percent $400$ units is to the $2,000$ units the vendor shipped. $($The problem$)$

$400=$ N$\%$ of $2,000($set up the problem; find or solve for $$N$)$

$400/2000=\mathrm{.}2$ or $20\%($show the calculations for finding $"$N$")$

$400$ is $20\%$ of the $2,000$ units shipped. $($the answer to the problem$)$