3923.81% is the change from 21 to 845
Calculation steps:
[( 845 - 21 ) ÷ 21] x 100 = 3923.81%
Formula
Percentage change = [(845 - 21) / 21] x 100
Subtract the new number by the original number
845 - 21 = 824
824 ÷ 21 = 39.23809523809524
39.23809523809524 x 100 = 3923.81%