Engineering Economics
If ‘a’ is the base amount expenditure, ‘b’ is the increase in the operation cost each year over a period of’ 'n’ years, the total cost of maintenance is:

a + (n - 1) b
a - (n - 1) b
a + (n + 1) b
a × (n - 1) b

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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 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

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