-90.39% is the change from 864 to 83
Calculation steps:
[( 83 - 864 ) ÷ 864] x 100 = -90.39%
Formula
Percentage change = [(83 - 864) / 864] x 100
Subtract the new number by the original number
83 - 864 = -781
-781 ÷ 864 = -0.9039351851851852
-0.9039351851851852 x 100 = -90.39%