2018 AMC 12A Problem 1

A large urn contains 100 balls, of which 36 \% are red and the rest are blue. How many of the blue balls must be removed so that the percentage of red balls in the urn will be 72 \%? (No red balls are to be removed.)

\textbf{(A)}\ 28 \qquad\textbf{(B)}\ 32 \qquad\textbf{(C)}\ 36 \qquad\textbf{(D)}\ 50 \qquad\textbf{(E)}\ 64

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.