AMC 12 2013b Problem 2

Mr. Green measures his rectangular garden by walking two of the sides and finds that it is $15$ steps by $20$ steps. Each of Mr. Green's steps is $2$ feet long. Mr. Green expects a half a pound of potatoes per square foot from his garden. How many pounds of potatoes does Mr. Green expect from his garden?

\textbf{(A)}\ 600 \textbf{(B)}\ 800 \textbf{(C)}\ 1000 \textbf{(D)}\ 1200 \textbf{(E)}\ 1400