2013 Cayley Problem 11

The lines with equations x = 4 and y = 3x form a triangle with the positive x-axis, as shown. The area of the triangle is

\textbf{(A)}\ 12\quad \textbf{(B)}\ 24\quad \textbf{(C)}\ 36\quad \textbf{(D)}\ 48\quad \textbf{(E)}\ 60

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Cayley contests here.