A manufacturer has an order for 20,000 megaphones. The megaphones, conical in shape, are to be 2 inches in diameter at the smaller end, 8 inches in diameter at the other end, and 1 ft. long. If 10% of the material used in manufacturing them will be wasted, how much material should be ordered?

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A: Recall the following fact.

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A: Consider the equation

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A: Recall the following unit conversion.

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A: See the attachment

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A: Area