6 A profit-maximising firm in a competitive market is able to sell its product for $6. At its current level of output, the firm's average total cost is $8. Its marginal cost curve crosses the marginal revenue curve at an output level of 20 units. What is the total loss of this firm? O A. more than $40 O B. exactly $40 O C. less than $40 O D. none of the above is necessarily correct