A 100-pair telephone cable can be constructed using either enameled wire or tinned wire. There are 400 soldered joints involved. The cost to solder each joint on enameled wire is P 1.65, while for tinned wire it is P 1.15. The price per linear foot for a 100-pair cable made with enameled wire is P 0.55, and for tinned wire it is P 0.75. What length of cable in feet will result in both installation options costing the same amount?

Engineering Economy MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Engineering Economycivil-engineering-mcqs › engineering-economy
Published
21 Jan 2019
Last updated
28 May 2026

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Explanation

To find the length where both installations cost the same, calculate the total cost for each wire type including soldering and cable cost per foot. Setting the total costs equal and solving for length gives 1,000 feet as the point where both options have identical expenses.

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