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