-49.21% is the change from 821 to 417
Calculation steps:
[( 417 - 821 ) ÷ 821] x 100 = -49.21%
Formula
Percentage change = [(417 - 821) / 821] x 100
Subtract the new number by the original number
417 - 821 = -404
-404 ÷ 821 = -0.4920828258221681
-0.4920828258221681 x 100 = -49.21%