For the given function, find the slope of the tangent line at 
. 
Definitions:
Unit Selling Price
The pricing of individual units of goods or services that a business offers for sale.
Break-even Point
The financial state where total costs equal total revenues, implying that the business is neither making a profit nor a loss.
Operating Income
The profit earned from a company's core business operations, excluding deductions of interest and tax.
Variable Costing
The concept that considers the cost of products manufactured to be composed only of those manufacturing costs that increase or decrease as the volume of production rises or falls (direct materials, direct labor, and variable factory overhead).
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