-83.55% is the change from 839 to 138
Calculation steps:
[( 138 - 839 ) ÷ 839] x 100 = -83.55%
Formula
Percentage change = [(138 - 839) / 839] x 100
Subtract the new number by the original number
138 - 839 = -701
-701 ÷ 839 = -0.8355184743742551
-0.8355184743742551 x 100 = -83.55%