Answer:
Incremental cost
Step-by-step explanation:
The incremental cost is the cost that is incurred for increase in the production level that means if the level of the production rises, the cost or an expense also increased. It involves both type of cost i.e. fixed and variable
Therefore in the given situation it is mentioned that
For the activity level of 23,000 units the cost $34,500 is spent
And, for the activity level of 28,000 units the cost $42,000 is spent
So this is an incremental cost