-39.83% is the change from 821 to 494
Calculation steps:
[( 494 - 821 ) ÷ 821] x 100 = -39.83%
Formula
Percentage change = [(494 - 821) / 821] x 100
Subtract the new number by the original number
494 - 821 = -327
-327 ÷ 821 = -0.3982947624847747
-0.3982947624847747 x 100 = -39.83%