The monthly production costs of Sheridan Company for two levels of production are as follows. Indicate which costs are variable, fixed and mixed, and select/dentify the reason for each answer. Cost 4,700units 2,700 units $16,200 Indirect labour $28,200 8,500 8.500 Supervisory salaries Maintenance 7.506 10.481 Cost Indirect labour Supervisory salaries Maintenance Cost labour isory salaries Fixed cost Mixed cost Variable cost enance Attempts: for Later 8,500 10,481