-80.82% is the change from 829 to 159
Calculation steps:
[( 159 - 829 ) ÷ 829] x 100 = -80.82%
Formula
Percentage change = [(159 - 829) / 829] x 100
Subtract the new number by the original number
159 - 829 = -670
-670 ÷ 829 = -0.8082026537997588
-0.8082026537997588 x 100 = -80.82%