Use the limit definition to find the slope of the tangent line to the graph of 
at the point 
Definitions:
Markup
The additional sum included in the purchase price of items to account for overhead costs and profit, which establishes the retail price.
Demand-Based Concept
A pricing strategy where prices are set based on consumer demand, often leading to dynamic pricing models.
Market Price
The current price at which an asset or service can be bought or sold.
Variable Cost Concept
The principle stating that costs change in proportion to changes in volume of activity or production.
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