-83.43% is the change from 839 to 139
Calculation steps:
[( 139 - 839 ) ÷ 839] x 100 = -83.43%
Formula
Percentage change = [(139 - 839) / 839] x 100
Subtract the new number by the original number
139 - 839 = -700
-700 ÷ 839 = -0.834326579261025
-0.834326579261025 x 100 = -83.43%