-84.94% is the change from 870 to 131
Calculation steps:
[( 131 - 870 ) ÷ 870] x 100 = -84.94%
Formula
Percentage change = [(131 - 870) / 870] x 100
Subtract the new number by the original number
131 - 870 = -739
-739 ÷ 870 = -0.8494252873563218
-0.8494252873563218 x 100 = -84.94%