Final answer:
To find the percentage increase, subtract the original value from the new value, divide by the original value, and multiply by 100%.
Step-by-step explanation:
To find the percentage increase, we can set up an equation using the formula:
Percentage increase = (new value - original value) / original value x 100%
In this case, the new value is 30 and the original value is 25. Plugging these values into the formula, we get:
(30 - 25) / 25 x 100% = 5 / 25 x 100% = 20%
Therefore, the percentage increase is 20%.