-38.12% is the change from 821 to 508
Calculation steps:
[( 508 - 821 ) ÷ 821] x 100 = -38.12%
Formula
Percentage change = [(508 - 821) / 821] x 100
Subtract the new number by the original number
508 - 821 = -313
-313 ÷ 821 = -0.3812423873325213
-0.3812423873325213 x 100 = -38.12%