-10.01% is the change from 999 to 899
Calculation steps:
[( 899 - 999 ) ÷ 999] x 100 = -10.01%
Formula
Percentage change = [(899 - 999) / 999] x 100
Subtract the new number by the original number
899 - 999 = -100
-100 ÷ 999 = -0.1001001001001001
-0.1001001001001001 x 100 = -10.01%