-5.12% is the change from 821 to 779
Calculation steps:
[( 779 - 821 ) ÷ 821] x 100 = -5.12%
Formula
Percentage change = [(779 - 821) / 821] x 100
Subtract the new number by the original number
779 - 821 = -42
-42 ÷ 821 = -0.05115712545676005
-0.05115712545676005 x 100 = -5.12%