-97.86% is the change from 980 to 21
Calculation steps:
[( 21 - 980 ) ÷ 980] x 100 = -97.86%
Formula
Percentage change = [(21 - 980) / 980] x 100
Subtract the new number by the original number
21 - 980 = -959
-959 ÷ 980 = -0.9785714285714285
-0.9785714285714285 x 100 = -97.86%