-2.79% is the change from 823 to 800
Calculation steps:
[( 800 - 823 ) ÷ 823] x 100 = -2.79%
Formula
Percentage change = [(800 - 823) / 823] x 100
Subtract the new number by the original number
800 - 823 = -23
-23 ÷ 823 = -0.027946537059538274
-0.027946537059538274 x 100 = -2.79%