-83.41% is the change from 838 to 139
Calculation steps:
[( 139 - 838 ) ÷ 838] x 100 = -83.41%
Formula
Percentage change = [(139 - 838) / 838] x 100
Subtract the new number by the original number
139 - 838 = -699
-699 ÷ 838 = -0.834128878281623
-0.834128878281623 x 100 = -83.41%