-50.67% is the change from 823 to 406
Calculation steps:
[( 406 - 823 ) ÷ 823] x 100 = -50.67%
Formula
Percentage change = [(406 - 823) / 823] x 100
Subtract the new number by the original number
406 - 823 = -417
-417 ÷ 823 = -0.5066828675577156
-0.5066828675577156 x 100 = -50.67%