Answer:
5.step-fixed cost.
Step-by-step explanation:
A fixed cost which does not change up to a certain level of activity and changes is when a level of activity is achieved. This cost increase on specific point and then remains fix and this process may repeat. In this question Salaries of oversee mangers are the step-fixed cost. Because it remained same until the Manufacturing hours goes upto 50,000, increases at this point and then remains same upto 75,000 and so on.