Answer:
The business manager should assume that the building expense is fixed.
Step-by-step explanation:
Fixed costs are not correlated with the revenue levels. Within the relevant range, fixed costs remain constant. They do not vary with the activity levels as variable costs do. For example, a manufacturer must pay for rent, repairs and maintenance, and utility bills irrespective of the revenue levels at which it is operating. This is why the business manager always discovers that the building expense each month does not correlate with the revenue levels, unlike the product's variable costs.