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
Using factor method, the depletion at any given year is equal to:

Initial cost of property times number of units sold during the year
Initial cost of property divided by the total units in property
Initial cost of property times number of unit sold during the year divided by the total units in property
Initial cost of property divided by the number of units sold during the year

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