-50.57% is the change from 870 to 430
Calculation steps:
[( 430 - 870 ) ÷ 870] x 100 = -50.57%
Formula
Percentage change = [(430 - 870) / 870] x 100
Subtract the new number by the original number
430 - 870 = -440
-440 ÷ 870 = -0.5057471264367817
-0.5057471264367817 x 100 = -50.57%