-85.9% is the change from 830 to 117
Calculation steps:
[( 117 - 830 ) ÷ 830] x 100 = -85.9%
Formula
Percentage change = [(117 - 830) / 830] x 100
Subtract the new number by the original number
117 - 830 = -713
-713 ÷ 830 = -0.8590361445783132
-0.8590361445783132 x 100 = -85.9%