can you please help me with this question? Thank you
A company has the following costs at 3 activity levels
Units $
5000 180000 8000 240000 11000 276000
The variable cost per unit is constant over this range of activity, but there is a step fixed cost and total fixed costs increase by 20% when the activity level exceeds 7500 units.
Estimate the expected total cost when the activity level is 7000 units.
I have an answer to this question, but I don’t understand the logic.