Cost, revenue, and profit are in dollars and x is the number of units. A firm knows that its marginal cost for a product is MC = 4x + 25, that its marginal revenue is MR = 65 - 6x, and that the cost of production of 60 units is $8,880. (a) Find the optimal level of production. units (b) Find the profit function. P( X ) = (c) Find the profit or loss at the optimal level. There is a loss of $ Need Help? Read It Show My Work (Optional)