Answer
$P=51.875$ Pa
Work Step by Step
As per the given problem, we have:
$P=k\dfrac{T}{V}$
Here, $k$ is defined as constant of proportionality
Plug the given values in the above expression, we get
$33.2=k\dfrac{400}{100}$
This gives $k=8.3 paLk^{-1}$
$P=8.3 \dfrac{500}{80}$
$\implies P=51.875$ Pa