A manufacturing company has four types of cost (identified as T1, T2 , T3 and T4). The total cost for each type at two different production levels is:
Cost type Total cost for 125 units Total cost for 180 units T1 1,000 1,260 T2 1,750 2,520 T3 2,475 2,826 T4 3,225 4,644 Which two cost types would be classified as being semi-variable?