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Find the total differential of the function .
Unit Sales
The volume of product sold, representing a key measure of a company's performance and sales activity.
Variable Expense
Expenses that change in proportion to the amount of goods produced or the volume of sales, like materials or commissions on sales.
Selling Price
The amount of money for which a product or service is sold to customers, setting the revenue baseline for a business.
Contribution Margin
The difference between sales revenue and variable costs, indicating how much revenue contributes to covering fixed costs and profit.
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