-97.08% is the change from 821 to 24
Calculation steps:
[( 24 - 821 ) ÷ 821] x 100 = -97.08%
Formula
Percentage change = [(24 - 821) / 821] x 100
Subtract the new number by the original number
24 - 821 = -797
-797 ÷ 821 = -0.9707673568818515
-0.9707673568818515 x 100 = -97.08%