Segment margin is defined as an investment center's contribution margin less the fixed costs that are traceable to the investment center. Option C
Generally, Contribution margin is the amount of revenue that is available to cover fixed costs after variable costs have been subtracted. Fixed costs are expenses that do not vary with changes in the volume of goods or services produced or sold. An investment center is a business unit that is responsible for generating its own revenues and incurring its own expenses.
Residual income is the net income of an investment center after subtracting an imputed cost of capital from the net income. It measures the profitability of an investment center beyond the required return on invested capital.
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