-99.18% is the change from 856 to 7
Calculation steps:
[( 7 - 856 ) ÷ 856] x 100 = -99.18%
Formula
Percentage change = [(7 - 856) / 856] x 100
Subtract the new number by the original number
7 - 856 = -849
-849 ÷ 856 = -0.991822429906542
-0.991822429906542 x 100 = -99.18%