-81.17% is the change from 823 to 155
Calculation steps:
[( 155 - 823 ) ÷ 823] x 100 = -81.17%
Formula
Percentage change = [(155 - 823) / 823] x 100
Subtract the new number by the original number
155 - 823 = -668
-668 ÷ 823 = -0.8116646415552855
-0.8116646415552855 x 100 = -81.17%