2020 AMC 8 Problem 15

Suppose 15\% of x equals 20\% of y. What percentage of x is y?

\textbf{(A) }5 \qquad \textbf{(B) }35 \qquad \textbf{(C) }75 \qquad \textbf{(D) }133 \frac13 \qquad \textbf{(E) }300

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