4020% is the change from 20 to 824
Calculation steps:
[( 824 - 20 ) ÷ 20] x 100 = 4020%
Formula
Percentage change = [(824 - 20) / 20] x 100
Subtract the new number by the original number
824 - 20 = 804
804 ÷ 20 = 40.2
40.2 x 100 = 4020%
Example