Identify whether each of the following is best described as a fixed, variable, or mixed cost with respect to product units. 1. Insurance on factory building. 2. Rubber used to manufacture athletic shoes. 3. Depreciation expense on equipment (straight-line). 4. Wages of an assembly-line worker paid on the basis of acceptable units produced. 5. Taxes on factory building. 6. Peanuts used in making trail mix. 7. Administrative assistant wages