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The cost, C, of materials for a deck varies jointly with the width w and the length l. If C = $470.40 when w = 12 and l = 16, find the cost when w = 10 and l = 25.
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The cost, C, of materials for a deck varies jointly with the width w and the length l. If C = $470.40 when w = 12 and l = 16, find the cost when w = 10 and l = 25.

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