Problem 10-132 [LO2] Solution a) Lost contribution margin -13000 Less fixed expenses avoided: Rent 1950 Utilities 920 Supervisors\' salaries 3,900 Maintenance 1,200 Administrative expenses 3,090 11060 Disadvantage of dropping Product C -1940 B) Since there is net disvantage of (1940) to dropping Product C , it should not be dropped. .