2456% is the change from 25 to 639
Calculation steps:
[( 639 - 25 ) ÷ 25] x 100 = 2456%
Formula
Percentage change = [(639 - 25) / 25] x 100
Subtract the new number by the original number
639 - 25 = 614
614 ÷ 25 = 24.56
24.56 x 100 = 2456%
Example