-84.61% is the change from 838 to 129
Calculation steps:
[( 129 - 838 ) ÷ 838] x 100 = -84.61%
Formula
Percentage change = [(129 - 838) / 838] x 100
Subtract the new number by the original number
129 - 838 = -709
-709 ÷ 838 = -0.8460620525059666
-0.8460620525059666 x 100 = -84.61%