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+15, that its marginal revenue is MR-65-6x, and that the cost of production of 60 units is $8,240 (a) Find the optimal level of production. units (b) Find the profit function P(M)- (c) Find the profit or loss at the optimal level. There is a f Need Help? of s But Aniwer View Previous Question Question 8 of 121 View Next Question