2007 Pascal Problem 16

In the table, the sum of the numbers in each row, column and diagonal is the same. What is the value of P + Q + R + S?

\begin{array}{|c|c|c|}\hline P & 4 & Q \\ \hline 10 & 16 & 22 \\ \hline R & 28 & S \\ \hline\end{array}

\textbf{(A)}\ 56\quad \textbf{(B)}\ 60\quad \textbf{(C)}\ 64\quad \textbf{(D)}\ 68\quad \textbf{(E)}\ 72

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Pascal contests here.