-81.3% is the change from 829 to 155
Calculation steps:
[( 155 - 829 ) ÷ 829] x 100 = -81.3%
Formula
Percentage change = [(155 - 829) / 829] x 100
Subtract the new number by the original number
155 - 829 = -674
-674 ÷ 829 = -0.8130277442702051
-0.8130277442702051 x 100 = -81.3%