-13.8% is the change from 978 to 843
Calculation steps:
[( 843 - 978 ) ÷ 978] x 100 = -13.8%
Formula
Percentage change = [(843 - 978) / 978] x 100
Subtract the new number by the original number
843 - 978 = -135
-135 ÷ 978 = -0.13803680981595093
-0.13803680981595093 x 100 = -13.8%