For the relevant cost data in items (1)-(7), indicate which of the following is the best classification.

(a) sunk cost

(b) incremental cost

(c) variable cost

(d) fixed cost

(e) semi-variable cost

(f) semi-fixed cost (g) controllable cost (i) opportunity cost (h) non-controllable cost (1) A company is considering selling an old machine. The machine has a book value of 20 000. In evaluating the decision to sell the machine, the 20 000 is a... (2) As an alternative to the old machine, the company can rent a new one. It will cost 3000 a year. In analysing the cost-volume behaviour the rental is a... (3) To run the firm's machines, here are two alternative courses of action. One is to pay the operator a base salary plus a small amount per unit produced. This makes the total cost of the operators a... (4) As an alternative, the firm can pay the opera- tors a flat salary. It would then use one machine when volume is low, two when it expands, and three during peak periods. This means that the total operator cost would now be a... (5) The machine mentioned in (1) could be sold for 8000. If the firm considers retaining and using it, the 8000 is a... (6) If the firm wishes to use the machine any longer, it must be repaired. For the decision to retain the machine, the repair cost is a... (7) The machine is charged to the foreman of each department at a rate of 3000 a year. In evaluating the foreman, the charge is a...LO1