-86.91% is the change from 978 to 128
Calculation steps:
[( 128 - 978 ) ÷ 978] x 100 = -86.91%
Formula
Percentage change = [(128 - 978) / 978] x 100
Subtract the new number by the original number
128 - 978 = -850
-850 ÷ 978 = -0.869120654396728
-0.869120654396728 x 100 = -86.91%