1950 AHSME Problems/Problem 23

Problem

A man buys a house for dollars and rents it. He puts of each month's rent aside for repairs and upkeep; pays 3255\frac{1}{2}$% on his investment. The monthly rent is:$ (Error compiling LaTeX. Unknown error_msg) \textbf{(A)}\ 30\%\qquad\textbf{(B)}\ 15\%\qquad\textbf{(C)}\ 72\%\qquad\textbf{(D)}\ 28\%\qquad\textbf{(E)}\ \text{None of these} $