-81.39% is the change from 833 to 155
Calculation steps:
[( 155 - 833 ) ÷ 833] x 100 = -81.39%
Formula
Percentage change = [(155 - 833) / 833] x 100
Subtract the new number by the original number
155 - 833 = -678
-678 ÷ 833 = -0.8139255702280912
-0.8139255702280912 x 100 = -81.39%