-48.6% is the change from 823 to 423
Calculation steps:
[( 423 - 823 ) ÷ 823] x 100 = -48.6%
Formula
Percentage change = [(423 - 823) / 823] x 100
Subtract the new number by the original number
423 - 823 = -400
-400 ÷ 823 = -0.48602673147023084
-0.48602673147023084 x 100 = -48.6%