A company's daily profit, , from selling two products, Product X and Product Y, can be modeled by the equation , where is the number of units of Product X sold and is the number of units of Product Y sold. Which of the following best describes what the number 500 represents in this equation?
The selling price of one unit of Product X.
The selling price of one unit of Product Y.
The total revenue generated from selling both products.
The fixed daily operating costs of the company.
