-9.09% is the change from 858 to 780
Calculation steps:
[( 780 - 858 ) ÷ 858] x 100 = -9.09%
Formula
Percentage change = [(780 - 858) / 858] x 100
Subtract the new number by the original number
780 - 858 = -78
-78 ÷ 858 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%