Question

Variable costs are:

sunk costs.
the change in total cost associated with the production of an additional unit of output.
costs that change every day.
costs that change with the amount of output a firm produces.

Answer 1

the change in total cost associated with the production of an additional unit of output.

Step-by-step explanation:

A variable cost is a cost that changes in relation to variations in an activity. In a business, the "activity" is frequently production volume.