-39.37% is the change from 828 to 502
Calculation steps:
[( 502 - 828 ) ÷ 828] x 100 = -39.37%
Formula
Percentage change = [(502 - 828) / 828] x 100
Subtract the new number by the original number
502 - 828 = -326
-326 ÷ 828 = -0.39371980676328505
-0.39371980676328505 x 100 = -39.37%