You
can use the word "inventory" and "fluctuate" in one
sentence like this:
(1) When they looked at the inventory, they found that the sales fluctuated for
the past 3 months.
(2) I think that the company's rank will continue to fluctuate due to failure
of looking at the over-all inventory of its profits and losses.
(3) Their opinions about the issue are fluctuating and all are recorded along
with the inventory.
(4) No matter how much you analyze this year's profit, you can't stop the sales
from fluctuating.