-13.91% is the change from 978 to 842
Calculation steps:
[( 842 - 978 ) ÷ 978] x 100 = -13.91%
Formula
Percentage change = [(842 - 978) / 978] x 100
Subtract the new number by the original number
842 - 978 = -136
-136 ÷ 978 = -0.1390593047034765
-0.1390593047034765 x 100 = -13.91%