At a loading dock, each worker on the night crew loaded \frac{3}{4} as many boxes as each worker on the day crew. If the night crew has \frac{4}{5} as many workers as the day crew, what fraction of all the boxes loaded by the two crews did the day crew load?
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A\frac{1}{2}
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B\frac{2}{5}
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C\frac{3}{5}
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D\frac{4}{5}
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E\frac{5}{8}