A certain liquid leaks out of a container at the rate of k liters for every x hours. If the liquid costs $6 per liter, what is the cost, in dollars, of the amount of the liquid that will leak out in y hours?
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A\frac{ky}{6x}
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B\frac{6x}{ky}
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C\frac{6k}{xy}
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D\frac{6ky}{x}
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E\frac{6xy}{k}
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正确答案: D