-85.79% is the change from 978 to 139
Calculation steps:
[( 139 - 978 ) ÷ 978] x 100 = -85.79%
Formula
Percentage change = [(139 - 978) / 978] x 100
Subtract the new number by the original number
139 - 978 = -839
-839 ÷ 978 = -0.8578732106339468
-0.8578732106339468 x 100 = -85.79%