Find the domain of the function. 
Definitions:
Sales Volume
The total number of units sold or services provided by a business in a specified period.
Margin of Safety
The difference between actual or estimated sales and the sales level necessary to break even, indicating the risk level of not reaching break-even point.
Sales
The total amount of money generated from selling goods or services.
Degree of Operating Leverage
A ratio that measures the sensitivity of a company's operating income to a percentage change in revenue.
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