-11.01% is the change from 899 to 800
Calculation steps:
[( 800 - 899 ) ÷ 899] x 100 = -11.01%
Formula
Percentage change = [(800 - 899) / 899] x 100
Subtract the new number by the original number
800 - 899 = -99
-99 ÷ 899 = -0.11012235817575083
-0.11012235817575083 x 100 = -11.01%