In the figure above, $\overline{MQ}$ and $\overline{NR}$ intersect at point $P$. $NP=QP$, and $MP=PR$.
If the measure of $\angle MNP$ is $65^{\circ }$ and $\angle QPR$ is $50^{\circ }$, what is the measure, in degrees, of $\angle PRQ$?