A gas undergoes a polytropic expansion process. In this process the polytropic constant $n$ is $1\mathrm{.}7.$ If the initial state is $P=300$kPa,$V=2m^3,$ what is most nearly the pressure when the volume has expanded to $3$ m $?$

$150$ kPa

$200$ kPa

$300$ kPa

$400$ kPa

None of these are correct