Answer:
525% increase
Explanation:
The percentage increase formula is:
(new number - old number/old number) × 100
We can now put in our numbers to substitute the variables.
(25000-4000/4000) × 100
=(21000/4000) × 100
=(5.25) × 100
= 525
Therefore, the answer is a 525% increase.
Hope this helps and good luck on your homework!