-22.77% is the change from 505 to 390
Calculation steps:
[( 390 - 505 ) ÷ 505] x 100 = -22.77%
Formula
Percentage change = [(390 - 505) / 505] x 100
Subtract the new number by the original number
390 - 505 = -115
-115 ÷ 505 = -0.22772277227722773
-0.22772277227722773 x 100 = -22.77%