-20.59% is the change from 505 to 401
Calculation steps:
[( 401 - 505 ) ÷ 505] x 100 = -20.59%
Formula
Percentage change = [(401 - 505) / 505] x 100
Subtract the new number by the original number
401 - 505 = -104
-104 ÷ 505 = -0.20594059405940593
-0.20594059405940593 x 100 = -20.59%