A firm operates in perfectly competitive market. The market price of its product is 6 birr and the cost function is given by 1/3Q3-5Q2+20Q+50, where TC is total cost and Q is the level of output. A. What level of output firm should the firm produce to maximize its profit? B. Determine the level of profit at equilibrium C. What a minimum price is required by the firm to stay in the market?​