-16.04% is the change from 505 to 424
Calculation steps:
[( 424 - 505 ) ÷ 505] x 100 = -16.04%
Formula
Percentage change = [(424 - 505) / 505] x 100
Subtract the new number by the original number
424 - 505 = -81
-81 ÷ 505 = -0.1603960396039604
-0.1603960396039604 x 100 = -16.04%