3955% is the change from 20 to 811
Calculation steps:
[( 811 - 20 ) ÷ 20] x 100 = 3955%
Formula
Percentage change = [(811 - 20) / 20] x 100
Subtract the new number by the original number
811 - 20 = 791
791 ÷ 20 = 39.55
39.55 x 100 = 3955%
Example