A manufacturing company that produces a single product has provided the following data concerning its most recent month of operations: 
The total contribution margin for the month under variable costing is:
Definitions:
Residual Income
Earnings generated beyond the minimum rate of return expected by a company or its investors, often used as a performance measure.
Gross Margin
The difference between sales revenue and the cost of goods sold, expressed as a percentage.
Average Operating Assets
The average value of assets used in the company's operations, calculated over a specific period to assess asset utilization efficiency.
Net Operating Income
The profit generated from a business's normal core operations, excluding deductions of taxes and interest costs.
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