4042.86% is the change from 21 to 870
Calculation steps:
[( 870 - 21 ) ÷ 21] x 100 = 4042.86%
Formula
Percentage change = [(870 - 21) / 21] x 100
Subtract the new number by the original number
870 - 21 = 849
849 ÷ 21 = 40.42857142857143
40.42857142857143 x 100 = 4042.86%