-87.01% is the change from 839 to 109
Calculation steps:
[( 109 - 839 ) ÷ 839] x 100 = -87.01%
Formula
Percentage change = [(109 - 839) / 839] x 100
Subtract the new number by the original number
109 - 839 = -730
-730 ÷ 839 = -0.8700834326579261
-0.8700834326579261 x 100 = -87.01%