At a certain symphonic concert, tickets for the orchestra level were \(\$50\) and tickets for the balcony level were \(\$30.\) These two ticket types were the only source of revenue for this concert. If \(R\%\) of the revenue for the concert was from the sale of balcony tickets, and \(B\%\) of the tickets sold were balcony tickets, then which of the following expresses \(B\) in terms of \(R?\)
(A) \(\dfrac{200R}{500+3R}\)
(B) \(\dfrac{300R}{500-2R}\)
(C) \(\dfrac{300R}{200+5R}\)
(D) \(\dfrac{500R}{300+2R}\)
(E) \(\dfrac{500R}{200+3R}\)
Answer: D
Source: Magoosh