-34.48% is the change from 870 to 570
Calculation steps:
[( 570 - 870 ) ÷ 870] x 100 = -34.48%
Formula
Percentage change = [(570 - 870) / 870] x 100
Subtract the new number by the original number
570 - 870 = -300
-300 ÷ 870 = -0.3448275862068966
-0.3448275862068966 x 100 = -34.48%
Example