-89.99% is the change from 799 to 80
Calculation steps:
[( 80 - 799 ) ÷ 799] x 100 = -89.99%
Formula
Percentage change = [(80 - 799) / 799] x 100
Subtract the new number by the original number
80 - 799 = -719
-719 ÷ 799 = -0.899874843554443
-0.899874843554443 x 100 = -89.99%