9514 1404 393
Answer:
25% increase
Explanation:
A percentage change is calculated using the formula ...
percent change = ((new value) - (old value))/(old value) × 100%
= (500 -400)/400 × 100%
= 100/400 × 100%
= 25%
A positive percentage change indicates an increase.
The change from 400 to 500 is a 25% increase.