4023.81% is the change from 21 to 866
Calculation steps:
[( 866 - 21 ) ÷ 21] x 100 = 4023.81%
Formula
Percentage change = [(866 - 21) / 21] x 100
Subtract the new number by the original number
866 - 21 = 845
845 ÷ 21 = 40.23809523809524
40.23809523809524 x 100 = 4023.81%