Final answer:
The cost per unit of variable cost would increase while the cost per unit of fixed cost would remain unchanged.
Step-by-step explanation:
In this situation, where the level of activity has decreased but is still within the relevant range, the cost per unit of V (variable cost) would increase.
This is because the total variable cost (V) is spread over a smaller level of activity, resulting in a higher cost per unit.
On the other hand, the cost per unit of F (fixed cost) would remain unchanged, as fixed costs do not vary with the level of activity.