-81.07% is the change from 824 to 156
Calculation steps:
[( 156 - 824 ) ÷ 824] x 100 = -81.07%
Formula
Percentage change = [(156 - 824) / 824] x 100
Subtract the new number by the original number
156 - 824 = -668
-668 ÷ 824 = -0.8106796116504854
-0.8106796116504854 x 100 = -81.07%