3220% is the change from 25 to 830
Calculation steps:
[( 830 - 25 ) ÷ 25] x 100 = 3220%
Formula
Percentage change = [(830 - 25) / 25] x 100
Subtract the new number by the original number
830 - 25 = 805
805 ÷ 25 = 32.2
32.2 x 100 = 3220%
Example