-81.17% is the change from 839 to 158
Calculation steps:
[( 158 - 839 ) ÷ 839] x 100 = -81.17%
Formula
Percentage change = [(158 - 839) / 839] x 100
Subtract the new number by the original number
158 - 839 = -681
-681 ÷ 839 = -0.8116805721096544
-0.8116805721096544 x 100 = -81.17%