-49.94% is the change from 809 to 405
Calculation steps:
[( 405 - 809 ) ÷ 809] x 100 = -49.94%
Formula
Percentage change = [(405 - 809) / 809] x 100
Subtract the new number by the original number
405 - 809 = -404
-404 ÷ 809 = -0.49938195302843014
-0.49938195302843014 x 100 = -49.94%