Problem # 4 ( class example ) Given a perfectly competitive firm in its long run position find the price , level of output and overall profits of the company if it i if it is known that its its long run total costs are given by the following equation TC - 50 0 9 - 20 91 + 2 91 Output and Price Profit andthe Find the number of firms and their output if the industry demand is given by : P - 1800 - 20