Answer
average revenue is 10 dollars, 50 units sold
Work Step by Step
In a competitive market, the price for a firm is the same as the marginal revenue for the firm. Also, for a competitive market, a firm's average revenue is the same as the marginal revenue.
Since the firm's marginal revenue is 10 dollars, the average revenue is also 10 dollars. Additionally, since the marginal revenue is 10 dollars, the price is also 10 dollars.
500 dollars/10 dollars per unit = 50 units sold
