-88.06% is the change from 829 to 99
Calculation steps:
[( 99 - 829 ) ÷ 829] x 100 = -88.06%
Formula
Percentage change = [(99 - 829) / 829] x 100
Subtract the new number by the original number
99 - 829 = -730
-730 ÷ 829 = -0.8805790108564535
-0.8805790108564535 x 100 = -88.06%