-15.2% is the change from 980 to 831
Calculation steps:
[( 831 - 980 ) ÷ 980] x 100 = -15.2%
Formula
Percentage change = [(831 - 980) / 980] x 100
Subtract the new number by the original number
831 - 980 = -149
-149 ÷ 980 = -0.1520408163265306
-0.1520408163265306 x 100 = -15.2%