Answer:
The variable cost is the cost which increases or decreases with the level of output of a company. There is direct relationship between variable cost and output of a firm.
The fixed costs are the costs which remains the same with any level production.
A step cost refers to a cost which remains constant at a particular level and vary after that level.
A mixed cost is a combination of both variable and fixed cost. Such as electricity companies which charges a fixed amount as well as variable cost according to the units consumed.
Therefore, the list are as follows:
(a) Variable cost
(b) Fixed cost
(c) Variable cost
(d) Fixed cost
(e) Step cost
(f) Fixed cost
(g) Mixed cost