6. The figure below shows the total cost and revenue curves for a firm on the same diagram. Construct these two curves in excel TC (total cost and TR Total Revenue). TC so U1 0 Costs and Revenues () to CD II.- %ii II.\" III. II.- E i o 10 20 so 40 so so 70 so 90 Quantity (a) How much is total fixed cost?..... ........ ........ ........ ........ ........ (b) At what outputs does the firm break even? (profit = 0)