-97.64% is the change from 890 to 21
Calculation steps:
[( 21 - 890 ) ÷ 890] x 100 = -97.64%
Formula
Percentage change = [(21 - 890) / 890] x 100
Subtract the new number by the original number
21 - 890 = -869
-869 ÷ 890 = -0.9764044943820225
-0.9764044943820225 x 100 = -97.64%