-87.47% is the change from 870 to 109
Calculation steps:
[( 109 - 870 ) ÷ 870] x 100 = -87.47%
Formula
Percentage change = [(109 - 870) / 870] x 100
Subtract the new number by the original number
109 - 870 = -761
-761 ÷ 870 = -0.8747126436781609
-0.8747126436781609 x 100 = -87.47%