-99% is the change from 799 to 8
Calculation steps:
[( 8 - 799 ) ÷ 799] x 100 = -99%
Formula
Percentage change = [(8 - 799) / 799] x 100
Subtract the new number by the original number
8 - 799 = -791
-791 ÷ 799 = -0.9899874843554443
-0.9899874843554443 x 100 = -99%