Answer:
The correct word for the blank space is: mixed.
Explanation:
Mixed costs or semi-variable costs are the results of adding fixed costs (those that do not change) to a variable cost (vary in proportion to the level of activity). Different levels of production in a company determine how much the mixed cost will be.
Thus, in Jack's case, his salary is the fixed costs and the $1.25 per unit assembled is the variable cost.