Find the differential of the function. 
Definitions:
Marginal Cost
The increase in total cost that arises from producing an additional unit of output.
Lawn-mowing
The act of cutting the grass in a garden or lawn to maintain its appearance and health.
Perfectly Competitive
A market structure where many firms offer a homogeneous product, there are no barriers to entry or exit, and all firms are price takers.
Short Run
A period in economics during which at least one factor of production is considered fixed, limiting the firm's ability to adjust to changes in market demand.
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