Stone Company, a maker of computers, incurred the following costs during the year:

Required:

Classify each cost as either fixed or variable cost.

1.Salary of the factory's supervisor

2.Materials needed to assemble the computers

3.Wages paid to an assembly line worker

4.Straight-line depreciation on the factory

5.Utility bill for the factory

6.Grease used to lubricate the machine

7.Rent paid for the factory

8.Property taxes on the factory and corporate office

9.Boxes used to package the completed computers

10.Advertising in a newspaper monthly