Place an $"$X$"$ in the appropriate column above to classify each of the costs as a period cost or product cost.

Amount

Product cost

Period cost

Total purchases of materials $($leather$,$ rubber, and other supplies$)$

$$214,900$

Marketing and advertising cost

$33,400$

Salaries and wages for sales, office staff, and executives

$146,000$

Utility costs for the factory

$9,700$

Commissions to the salespeople

$12,500$

Depreciation of factory and equipment

$27,000$

Factory supervisor salaries

$66,000$

Wages for factory workers

$227,100$

Insurance on the factory

$15,500$

Research and development

$24,300$