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Requirement 1a. Allocate the two support departments' costs to the two operating departments using the reciprocal method. First, determine the linear equations for each support department. AS= IS = Direct method Step-down method (AS first) Step-down method (IS first) Reference Requirement 1a. Allocate the two support departments' costs to the two operating departments using the reciprocal method. First, determine the linear equations for each support department. AS= IS = Direct method Step-down method (AS first) Step-down method (IS first) Reference