3960% is the change from 20 to 812
Calculation steps:
[( 812 - 20 ) ÷ 20] x 100 = 3960%
Formula
Percentage change = [(812 - 20) / 20] x 100
Subtract the new number by the original number
812 - 20 = 792
792 ÷ 20 = 39.6
39.6 x 100 = 3960%
Example