18.65% is the change from 429 to 509
Calculation steps:
[( 509 - 429 ) ÷ 429] x 100 = 18.65%
Formula
Percentage change = [(509 - 429) / 429] x 100
Subtract the new number by the original number
509 - 429 = 80
80 ÷ 429 = 0.1864801864801865
0.1864801864801865 x 100 = 18.65%