-88.99% is the change from 990 to 109
Calculation steps:
[( 109 - 990 ) ÷ 990] x 100 = -88.99%
Formula
Percentage change = [(109 - 990) / 990] x 100
Subtract the new number by the original number
109 - 990 = -881
-881 ÷ 990 = -0.8898989898989899
-0.8898989898989899 x 100 = -88.99%