4209.52% is the change from 21 to 905
Calculation steps:
[( 905 - 21 ) ÷ 21] x 100 = 4209.52%
Formula
Percentage change = [(905 - 21) / 21] x 100
Subtract the new number by the original number
905 - 21 = 884
884 ÷ 21 = 42.095238095238095
42.095238095238095 x 100 = 4209.52%