CEMC Pascal, 2003

Algebra Difficulty 1.0 Junior Find the answer Canada

At a math conference, the following exchange rates are used: $1$ calculator $= 100$ rulers, $10$ rulers $= 30$ compasses, $25$ compasses $= 50$ protractors. How many protractors are equivalent to 1 calculator?

(A) $400$ (B) $600$ (C) $300$ (D) $500$ (E) $200$

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