-17.82% is the change from 505 to 415
Calculation steps:
[( 415 - 505 ) ÷ 505] x 100 = -17.82%
Formula
Percentage change = [(415 - 505) / 505] x 100
Subtract the new number by the original number
415 - 505 = -90
-90 ÷ 505 = -0.1782178217821782
-0.1782178217821782 x 100 = -17.82%