-98.87% is the change from 799 to 9
Calculation steps:
[( 9 - 799 ) ÷ 799] x 100 = -98.87%
Formula
Percentage change = [(9 - 799) / 799] x 100
Subtract the new number by the original number
9 - 799 = -790
-790 ÷ 799 = -0.9887359198998749
-0.9887359198998749 x 100 = -98.87%