-85.05% is the change from 856 to 128
Calculation steps:
[( 128 - 856 ) ÷ 856] x 100 = -85.05%
Formula
Percentage change = [(128 - 856) / 856] x 100
Subtract the new number by the original number
128 - 856 = -728
-728 ÷ 856 = -0.8504672897196262
-0.8504672897196262 x 100 = -85.05%