-37.95% is the change from 809 to 502
Calculation steps:
[( 502 - 809 ) ÷ 809] x 100 = -37.95%
Formula
Percentage change = [(502 - 809) / 809] x 100
Subtract the new number by the original number
502 - 809 = -307
-307 ÷ 809 = -0.3794808405438813
-0.3794808405438813 x 100 = -37.95%