-89.74% is the change from 78 to 8
Calculation steps:
[( 8 - 78 ) ÷ 78] x 100 = -89.74%
Formula
Percentage change = [(8 - 78) / 78] x 100
Subtract the new number by the original number
8 - 78 = -70
-70 ÷ 78 = -0.8974358974358975
-0.8974358974358975 x 100 = -89.74%