In a certain district, the ratio of the number of registered Republicans to the number of registered Democrats was

In a certain district, the ratio of the number of registered Republicans to the number of registered Democrats was $\dfrac35.$ After $600$ additional Republicans and $500$ additional Democrats registered, the ratio was $\dfrac45.$ After these registrations, there were how many more voters in the district registered as Democrats than as Republicans?

(A) 100
(B) 300
(C) 400
(D) 1,000
(E) 2,500

Answer: B

Source: Official Guide

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