-52.49% is the change from 823 to 391
Calculation steps:
[( 391 - 823 ) ÷ 823] x 100 = -52.49%
Formula
Percentage change = [(391 - 823) / 823] x 100
Subtract the new number by the original number
391 - 823 = -432
-432 ÷ 823 = -0.5249088699878494
-0.5249088699878494 x 100 = -52.49%