-30.61% is the change from 980 to 680
Calculation steps:
[( 680 - 980 ) ÷ 980] x 100 = -30.61%
Formula
Percentage change = [(680 - 980) / 980] x 100
Subtract the new number by the original number
680 - 980 = -300
-300 ÷ 980 = -0.30612244897959184
-0.30612244897959184 x 100 = -30.61%