Suppose a monopolist's profit-maximizing output is 400 units per week and that the firm sells its output at a price of $60 per unit The firm has total costs of $10.000 per week. Assume the monopolist is maximizing Its profit and earns $40 per unit from the sale of the last unit produced each week Instructions: Enter your answers as a whole number, a. What are the firm's weekly economic profits? b. What is the firm's marginal cost? S c. What is the firm's average total cost? S