### Assume that the cross section of each strand is a circle

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A regional telephone company has 10 million subscribers. Each of their telephones is connected to a central office by a copper twisted pair. The average length of these twisted pairs is 10 km. How much is the copper in the local loops worth?

Assume that the cross section of each strand is a circle 1mm in diameter, the density of copper is 9.0 grams/cm^3 and that copper sells for 3 dollars per kilogram.

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