Engineering Economics
The alternatives which are standalone solutions for given situations in engineering involve:

The anticipated life of the assets
All of these
A purchase cost (first cost)
The anticipated resalable value (salvage value) and the interest return (rate of return)

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

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

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