-81.5% is the change from 838 to 155
Calculation steps:
[( 155 - 838 ) ÷ 838] x 100 = -81.5%
Formula
Percentage change = [(155 - 838) / 838] x 100
Subtract the new number by the original number
155 - 838 = -683
-683 ÷ 838 = -0.815035799522673
-0.815035799522673 x 100 = -81.5%