-49.09% is the change from 821 to 418
Calculation steps:
[( 418 - 821 ) ÷ 821] x 100 = -49.09%
Formula
Percentage change = [(418 - 821) / 821] x 100
Subtract the new number by the original number
418 - 821 = -403
-403 ÷ 821 = -0.49086479902557856
-0.49086479902557856 x 100 = -49.09%