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
Under the depletion allowance method in computing depreciation, the depletion charge is equal to either ______ whichever is smaller.

Fixed percentage of gross income or 50% of the net taxable income
50% of the fixed percentage of gross income or 50% of the net taxable income
50% of the fixed percentage of gross income or the net taxable income
Fixed percentage of gross income or the net taxable income

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