-20.2% is the change from 505 to 403
Calculation steps:
[( 403 - 505 ) ÷ 505] x 100 = -20.2%
Formula
Percentage change = [(403 - 505) / 505] x 100
Subtract the new number by the original number
403 - 505 = -102
-102 ÷ 505 = -0.201980198019802
-0.201980198019802 x 100 = -20.2%