pls help

A business normally produces and sells as much as demand allows. However, sometimes is constrained by some limiting factors. And if the business makes more than one product. What are the limiting factors and how does the business determine the profit-maximizing production mix? XZ company is selling product A, according to the company when the price of product A is \$28, the expected demand is 50,000 units per week. However, when the price is $58, only 20,000 units are demanded per week. Required What is the demand function for product A