The Duncan Company provided the following information: 
The operating income before amortization during each of the three years the machine was in use was $300,000.
Compute:
a. the rate of return on the average investment for each of the three years using the net book value.
b. the rate of return on the average investment for each of the three years using the gross book value.
Definitions:
Economic Efficiency
The optimal use of resources to achieve the best possible output or outcome with minimal waste or expense.
Unpleasant Work
Jobs or tasks that are considered physically or emotionally uncomfortable, distressing, or dangerous.
Mainstream Economics
The body of economic thought considered orthodox or widely accepted, typically centered around the equilibrium between supply and demand.
Balancing Power
The act of equalizing influence or control among different groups or individuals, often in the context of labor relations.
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