-87.94% is the change from 829 to 100
Calculation steps:
[( 100 - 829 ) ÷ 829] x 100 = -87.94%
Formula
Percentage change = [(100 - 829) / 829] x 100
Subtract the new number by the original number
100 - 829 = -729
-729 ÷ 829 = -0.879372738238842
-0.879372738238842 x 100 = -87.94%