2400% is the change from 1 to 25
Calculation steps:
[( 25 - 1 ) ÷ 1] x 100 = 2400%
Formula
Percentage change = [(25 - 1) / 1] x 100
Subtract the new number by the original number
25 - 1 = 24
24 ÷ 1 = 24
24 x 100 = 2400%
Example