-78.39% is the change from 870 to 188
Calculation steps:
[( 188 - 870 ) ÷ 870] x 100 = -78.39%
Formula
Percentage change = [(188 - 870) / 870] x 100
Subtract the new number by the original number
188 - 870 = -682
-682 ÷ 870 = -0.7839080459770115
-0.7839080459770115 x 100 = -78.39%