Input: To find the percentage change from 20 to 25, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value
Difference = 25 - 20
Difference = 5

Step 2: Next, we need to find the absolute value of the difference. This is because percentage change is always calculated as a positive value.

Absolute Difference = |Difference|
Absolute Difference = |5|
Absolute Difference = 5

Step 3: Now, we can calculate the percentage change using the formula:

Percentage Change = (Absolute Difference / Initial Value) x 100

Percentage Change = (5 / 20) x 100
Percentage Change = 25%