-83.27% is the change from 771 to 129
Calculation steps:
[( 129 - 771 ) ÷ 771] x 100 = -83.27%
Formula
Percentage change = [(129 - 771) / 771] x 100
Subtract the new number by the original number
129 - 771 = -642
-642 ÷ 771 = -0.8326848249027238
-0.8326848249027238 x 100 = -83.27%