-6.39% is the change from 876 to 820
Calculation steps:
[( 820 - 876 ) ÷ 876] x 100 = -6.39%
Formula
Percentage change = [(820 - 876) / 876] x 100
Subtract the new number by the original number
820 - 876 = -56
-56 ÷ 876 = -0.0639269406392694
-0.0639269406392694 x 100 = -6.39%