-84.93% is the change from 856 to 129
Calculation steps:
[( 129 - 856 ) ÷ 856] x 100 = -84.93%
Formula
Percentage change = [(129 - 856) / 856] x 100
Subtract the new number by the original number
129 - 856 = -727
-727 ÷ 856 = -0.8492990654205608
-0.8492990654205608 x 100 = -84.93%