-20.67% is the change from 508 to 403
Calculation steps:
[( 403 - 508 ) ÷ 508] x 100 = -20.67%
Formula
Percentage change = [(403 - 508) / 508] x 100
Subtract the new number by the original number
403 - 508 = -105
-105 ÷ 508 = -0.20669291338582677
-0.20669291338582677 x 100 = -20.67%