-50.31% is the change from 809 to 402
Calculation steps:
[( 402 - 809 ) ÷ 809] x 100 = -50.31%
Formula
Percentage change = [(402 - 809) / 809] x 100
Subtract the new number by the original number
402 - 809 = -407
-407 ÷ 809 = -0.5030902348578492
-0.5030902348578492 x 100 = -50.31%