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

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

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