QUESTION 15 A firm knows that its marginal cost for a product is MC = 3x + 20, that its marginal revenue is MR = 44 - 5X, and that the cost production of 80 units is $11,400. Choose all that applies. A. At the optimal level of production, the profit is a loss of $164. B. The optimal production level can be found by equating marginal cost and marginal revenue, namely by solving the equation 3x + 20 - 44 - 5x O C. The profit function is given by P(x) = 24x - 4x