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

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

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Engineering Economics
The key to profitable operation for project cost control, is:

To keep the project cost equal to subsequent construction budget
None of these
To keep the project cost within the cost budget and knowing when and where job costs are deviating
To keep the project cost equal to original cost estimate

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