6. As mentioned, direct costs are not always variable costs. Considera company that makes home appliances and define an individual refrigerator as a cost object. Which of the following costs is a direct. fixed cost The electricity costs that incur in the plant The salaries of full time workers who assemble the refrigerators paid on a monthly basis, assuming no overtime allowance has been incurred The salary of the maintenance staff in the workshop pad on the monthly basis Sales como pardona per unit sold basis