-50.92% is the change from 870 to 427
Calculation steps:
[( 427 - 870 ) ÷ 870] x 100 = -50.92%
Formula
Percentage change = [(427 - 870) / 870] x 100
Subtract the new number by the original number
427 - 870 = -443
-443 ÷ 870 = -0.5091954022988506
-0.5091954022988506 x 100 = -50.92%