You're 17 years old and recently you started a business hauling junk to the city dump to make some extra money on weekends. Your business license cost $200. You bought an old truck from your uncle for $3,000, you spent $300 on advertising, and the dump charges a disposal fee of $30 for each truckload you drop off. The average trip takes one hour and costs you $20 in gas. You charge $120 per truckload and haul 5 truckloads every weekend.

1. Which of your costs are fixed costs? How can you tell?