Find an equation of the tangent line to the curve. 
Definitions:
Operating Profit
A company's profit from its regular business operations, excluding expenses from interest, taxes, and other non-operational activities.
Operating Profit
Operating profit is the income earned from a company's core business operations, excluding deductions of interest and taxes.
Markdown Rate
The percentage reduction from the original price of an item to its sale price.
Mark-up
Surcharging the cost price of commodities to envelop overheads and assure profits.
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