-89.8% is the change from 980 to 100
Calculation steps:
[( 100 - 980 ) ÷ 980] x 100 = -89.8%
Formula
Percentage change = [(100 - 980) / 980] x 100
Subtract the new number by the original number
100 - 980 = -880
-880 ÷ 980 = -0.8979591836734694
-0.8979591836734694 x 100 = -89.8%