Engineering Economics
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 1.65 on the tinned wire, it will be P 1.15. A 100- pair cable made up with enameled wire cost P 0.55 per linear foot and those made up of tinned wire cost P 0.75 per linear foot. Determine the length of cable run in feet so that the cost of each installation would be the same.

1,120 feet
1,000 feet
1,100 feet
1,040 feet

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Engineering Economics
Pick up the correct reason for making conceptual (or preliminary) estimate from the following:

To compute target estimate for the owner while drawing and specifications are in initial stage
To check quotations from contractors and/or sub-contractors
All of these
To have a check on a definitive cost estimate

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