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

If ‘a’ is the base amount expenditure, ‘b’ is the increase in

1.	If ‘a’ is the base amount expenditure, ‘b’ is the increase in the operation cost eachyear over a period of’ 'n’ years, the total cost of maintenance is:
A.	a + (n + 1) b
B.	a + (n - 1) b
C.	a × (n - 1) b
D.	a - (n - 1) b
Answer» C. a × (n - 1) b