2005 AMC 10A Problem 1

While eating out, Mike and Joe each tipped their server \$2. Mike tipped 10\% of his bill and Joe tipped 20\% of his bill. What was the difference, in dollars, between their bills?

\textbf{(A) } 2\qquad \textbf{(B) } 4\qquad \textbf{(C) } 5\qquad \textbf{(D) } 10\qquad \textbf{(E) } 20

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