Answer
$20:1$.
Work Step by Step
The given values are
$F_l=4000\;lb$.
$F_s=200\;lb$.
Formula is
$\Rightarrow MA=\frac{F_l}{F_s}$
Substitute all the values.
$\Rightarrow MA=\frac{4000\;lb}{200\;lb}$
Simplify.
$\Rightarrow MA=\frac{20}{1}$
Hence, the $MA$ is $20:1$.
