Various costs are given below are associated with running a commercial bakery that provide baked goods to local coffee shops

1. Account's managers salary 2. Rent on building 3. Flour used in making of croissants 4. Bakery managers salary 5. Wages of bakers who are paid on piecework basis 6. Depreviation of commervial ovens used in baking 7. Insurance on the building

Classify each cost as being variable or fixed cost?