(a) Identify the cost behavior in each of the following tables as:
(I) Fixed cost; or
(ii) Variable cost; or
(iii) Semi-variable cost.
(b) Draw a graph for each table to illustrate the cost behavior.

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Cost X Output (units) 100 300 500 200 400 Total cost (£) 600 600 600 600 600 Unit cost (£) 3.00 6.00 2.00 1.50 1.20 Cost Y Output (units) Total cost (£) Unit cost (£) 100 500 200 300 400 1,200 300 600 900 1,500 3.00 3.00 3.00 3.00 3.00 Cost Z Output (units) Total cost (£) Unit cost (£) 100 200 300 400 500 900 660 720 780 840 1.80 6.60 3.60 2.60 2.10