2003 Pascal Problem 12

At a math conference, the following exchange rates are used: \begin{array}{rcl} 1 \text{ calculator} &=& 100 \text{ rulers} \\ 10 \text{ rulers} &=& 30 \text{ compasses} \\ 25 \text{ compasses} &=& 50 \text{ protractors} \end{array} How many protractors are equivalent to 1 calculator?

\textbf{(A)}\ 400\quad \textbf{(B)}\ 600\quad \textbf{(C)}\ 300\quad \textbf{(D)}\ 500\quad \textbf{(E)}\ 200

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 Pascal contests here.