-81.19% is the change from 824 to 155
Calculation steps:
[( 155 - 824 ) ÷ 824] x 100 = -81.19%
Formula
Percentage change = [(155 - 824) / 824] x 100
Subtract the new number by the original number
155 - 824 = -669
-669 ÷ 824 = -0.8118932038834952
-0.8118932038834952 x 100 = -81.19%