-9.21% is the change from 858 to 779
Calculation steps:
[( 779 - 858 ) ÷ 858] x 100 = -9.21%
Formula
Percentage change = [(779 - 858) / 858] x 100
Subtract the new number by the original number
779 - 858 = -79
-79 ÷ 858 = -0.09207459207459208
-0.09207459207459208 x 100 = -9.21%