-90.91% is the change from 858 to 78
Calculation steps:
[( 78 - 858 ) ÷ 858] x 100 = -90.91%
Formula
Percentage change = [(78 - 858) / 858] x 100
Subtract the new number by the original number
78 - 858 = -780
-780 ÷ 858 = -0.9090909090909091
-0.9090909090909091 x 100 = -90.91%