-39.27% is the change from 820 to 498
Calculation steps:
[( 498 - 820 ) ÷ 820] x 100 = -39.27%
Formula
Percentage change = [(498 - 820) / 820] x 100
Subtract the new number by the original number
498 - 820 = -322
-322 ÷ 820 = -0.3926829268292683
-0.3926829268292683 x 100 = -39.27%