AMC 12 2005a Problem 1

Two is $10 \%$ of $x$ and $20 \%$ of $y$. What is $x - y$?

$\textbf{(A) } 1 \textbf{(B) } 2 \textbf{(C) } 5 \textbf{(D) } 10 \textbf{(E) } 20$