The following is a list of various costs in producing sweatshirts. With respect to the manufacture and sale of sweatshirts, classify each cost as either variable, fixed, or mixed.

1. Property insurance premiums, $1,000 per month plus $.005 for each dollar of property over $2,000,000.
2. Pension cost, $.20 per employee hour on the job.
3. Units of production depreciation on sewing machines.
4. Fee paid to security company for monthly service.
5. Afternoon snacks.
6. Quality inspectors salary.
7. Patents on machines.
8. Lawn service contract at $200 per month.
9. Patterns for shirts.
10. Drawing paper for students artwork.