2452% is the change from 25 to 638
Calculation steps:
[( 638 - 25 ) ÷ 25] x 100 = 2452%
Formula
Percentage change = [(638 - 25) / 25] x 100
Subtract the new number by the original number
638 - 25 = 613
613 ÷ 25 = 24.52
24.52 x 100 = 2452%
Example