AMC 8 2020 Problem 15

Suppose $15\%$ of $x$ equals $20\%$ of $y.$ What percentage of $x$ is $y?$ $\textbf{(A) }5 \textbf{(B) }35 \textbf{(C) }75 \textbf{(D) }133 \frac13 \textbf{(E) }300$