19.84% is the change from 509 to 610
Calculation steps:
[( 610 - 509 ) ÷ 509] x 100 = 19.84%
Formula
Percentage change = [(610 - 509) / 509] x 100
Subtract the new number by the original number
610 - 509 = 101
101 ÷ 509 = 0.19842829076620824
0.19842829076620824 x 100 = 19.84%