-8.99% is the change from 990 to 901
Calculation steps:
[( 901 - 990 ) ÷ 990] x 100 = -8.99%
Formula
Percentage change = [(901 - 990) / 990] x 100
Subtract the new number by the original number
901 - 990 = -89
-89 ÷ 990 = -0.0898989898989899
-0.0898989898989899 x 100 = -8.99%