-4.99% is the change from 821 to 780
Calculation steps:
[( 780 - 821 ) ÷ 821] x 100 = -4.99%
Formula
Percentage change = [(780 - 821) / 821] x 100
Subtract the new number by the original number
780 - 821 = -41
-41 ÷ 821 = -0.049939098660170524
-0.049939098660170524 x 100 = -4.99%