-89.79% is the change from 842 to 86
Calculation steps:
[( 86 - 842 ) ÷ 842] x 100 = -89.79%
Formula
Percentage change = [(86 - 842) / 842] x 100
Subtract the new number by the original number
86 - 842 = -756
-756 ÷ 842 = -0.8978622327790974
-0.8978622327790974 x 100 = -89.79%