4040% is the change from 20 to 828
Calculation steps:
[( 828 - 20 ) ÷ 20] x 100 = 4040%
Formula
Percentage change = [(828 - 20) / 20] x 100
Subtract the new number by the original number
828 - 20 = 808
808 ÷ 20 = 40.4
40.4 x 100 = 4040%
Example