-11.11% is the change from 990 to 880
Calculation steps:
[( 880 - 990 ) ÷ 990] x 100 = -11.11%
Formula
Percentage change = [(880 - 990) / 990] x 100
Subtract the new number by the original number
880 - 990 = -110
-110 ÷ 990 = -0.1111111111111111
-0.1111111111111111 x 100 = -11.11%