-48.96% is the change from 821 to 419
Calculation steps:
[( 419 - 821 ) ÷ 821] x 100 = -48.96%
Formula
Percentage change = [(419 - 821) / 821] x 100
Subtract the new number by the original number
419 - 821 = -402
-402 ÷ 821 = -0.48964677222898906
-0.48964677222898906 x 100 = -48.96%