-73.82% is the change from 978 to 256
Calculation steps:
[( 256 - 978 ) ÷ 978] x 100 = -73.82%
Formula
Percentage change = [(256 - 978) / 978] x 100
Subtract the new number by the original number
256 - 978 = -722
-722 ÷ 978 = -0.7382413087934561
-0.7382413087934561 x 100 = -73.82%