4285.71% is the change from 21 to 921
Calculation steps:
[( 921 - 21 ) ÷ 21] x 100 = 4285.71%
Formula
Percentage change = [(921 - 21) / 21] x 100
Subtract the new number by the original number
921 - 21 = 900
900 ÷ 21 = 42.857142857142854
42.857142857142854 x 100 = 4285.71%