The single-rate approach divides the costs of each support department into two pools: one with variable costs and one with fixed costs.
Because it recognizes reciprocal services between service departments, the reciprocal method is the most accurate of the three methods for allocating costs to service departments. Because it requires solving a set of simultaneous linear equations, it is also the most difficult method.
There are three ways to divide costs for the support department: the direct, the reciprocal, and the step-down. The assumptions regarding how services provided by one support department are distributed to other support departments are the primary distinctions between the methods.
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