-17.21% is the change from 610 to 505
Calculation steps:
[( 505 - 610 ) ÷ 610] x 100 = -17.21%
Formula
Percentage change = [(505 - 610) / 610] x 100
Subtract the new number by the original number
505 - 610 = -105
-105 ÷ 610 = -0.1721311475409836
-0.1721311475409836 x 100 = -17.21%