2005 AMC 12A Problem 1

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

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

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