A profit-maximizing firm in a competitive market is currently producing 90 units of output. It has average revenue of $6, average total cost of $6, and fixed cost of $270. Complete the following table by indicating the firm's profit, marginal cost, and average variable cost. Profit Marginal Cost Average Variable Cost (Dollars) (Dollars) (Dollars) The efficient scale of the firm must be Choose an item. 90 units. A profit-maximizing firm in a competitive market is currently producing 90 units of output. It has average revenue of $6, average total cost of $6, and fixed cost of $270. Complete the following table by indicating the firm's profit, marginal cost, and average variable cost. Profit Marginal Cost Average Variable Cost (Dollars) (Dollars) (Dollars) The efficient scale of the firm must be Choose an item. 90 units.