-50.91% is the change from 823 to 404
Calculation steps:
[( 404 - 823 ) ÷ 823] x 100 = -50.91%
Formula
Percentage change = [(404 - 823) / 823] x 100
Subtract the new number by the original number
404 - 823 = -419
-419 ÷ 823 = -0.5091130012150669
-0.5091130012150669 x 100 = -50.91%