-22.11% is the change from 502 to 391
Calculation steps:
[( 391 - 502 ) ÷ 502] x 100 = -22.11%
Formula
Percentage change = [(391 - 502) / 502] x 100
Subtract the new number by the original number
391 - 502 = -111
-111 ÷ 502 = -0.22111553784860558
-0.22111553784860558 x 100 = -22.11%