Part of the cost data of TNBC plc, has been keyed into the computer as a table below by the person in charge of accounts. Because he has resigned, you have been called to fill up the blanks in the firms' cost data. Output Total Fixed Cost Cost 0 1 2 3 4 5 6 108 50 Variable Average Cost Cost 24 47 Average Average variable Fixed Cost cost Cost b) Which time periof is the firm operating in? why 39.2 a) Count and fill in the cost that is missing from the table above Marginal 16 52 (8 marks) (2 marks) (Total: 10 Marks)