-97.21% is the change from 823 to 23
Calculation steps:
[( 23 - 823 ) ÷ 823] x 100 = -97.21%
Formula
Percentage change = [(23 - 823) / 823] x 100
Subtract the new number by the original number
23 - 823 = -800
-800 ÷ 823 = -0.9720534629404617
-0.9720534629404617 x 100 = -97.21%