A firm has the following average variable cost equation. AVC = 60 - 15Q+Q2 And the average total cost (ATC) of this firm is BD1260 at Q = 40. 1. Based on the above information, what is the total fixed cost (TFC) of this firm? 2. Based on the above information, what is the marginal cost (MC) of this firm? 3. Based on the above information, determine the level of output of this firm at which stage Il of production occurs first