A telephone switchboard 100 pair cable can be made up with either enameled wire or tinned wire. There will be 400 soldered connections. The cost of soldering a connection on the enameled wire will be P 16.50, and on the tinned wire P 11.50. A 100 – pair cable made up with the enameled wire cost P 5.50 per foot and those made up with tinned wire cost P 7.60 per foot. Determine the length of the cable run, in ft, so that the cost of each installation would be the same.

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