21.02% is the change from 509 to 616
Calculation steps:
[( 616 - 509 ) ÷ 509] x 100 = 21.02%
Formula
Percentage change = [(616 - 509) / 509] x 100
Subtract the new number by the original number
616 - 509 = 107
107 ÷ 509 = 0.21021611001964635
0.21021611001964635 x 100 = 21.02%