-97.53% is the change from 849 to 21
Calculation steps:
[( 21 - 849 ) ÷ 849] x 100 = -97.53%
Formula
Percentage change = [(21 - 849) / 849] x 100
Subtract the new number by the original number
21 - 849 = -828
-828 ÷ 849 = -0.9752650176678446
-0.9752650176678446 x 100 = -97.53%