-81.46% is the change from 836 to 155
Calculation steps:
[( 155 - 836 ) ÷ 836] x 100 = -81.46%
Formula
Percentage change = [(155 - 836) / 836] x 100
Subtract the new number by the original number
155 - 836 = -681
-681 ÷ 836 = -0.8145933014354066
-0.8145933014354066 x 100 = -81.46%