Classify each cost as a period or a product cost.

1.		Advertising costs
2.		Glue and nails used in production
3.		Depreciation on factory equipment
4.		Sales commission paid to salesperson
5.		Salary of controller
6.		Wages paid to assembly-line workers
7.		Flour used in baking cakes
8.		Utilities of the factory building
9.		Property taxes paid on the main office building
10.		Office supplies purchased