Is considered a variable operating expense of an automobile. user: insurance experts have estimated that extra costs of up to $ a year may be required to replace the services of a homemaker in a family with small children.

The answer is maintenance. Maintainance is considered a variable operating expense of an automobile. The more the car is being driven, the higher the expense for the maintenance since the tires are used and oil-lube are executed.
 Insurance experts have estimated that extra costs of up to $10,000 a year may be required to replace the services of a homemaker in a family with small children.

Iprobably use google