-97.46% is the change from 827 to 21
Calculation steps:
[( 21 - 827 ) ÷ 827] x 100 = -97.46%
Formula
Percentage change = [(21 - 827) / 827] x 100
Subtract the new number by the original number
21 - 827 = -806
-806 ÷ 827 = -0.9746070133010882
-0.9746070133010882 x 100 = -97.46%