68.54% is the change from 302 to 509
Calculation steps:
[( 509 - 302 ) ÷ 302] x 100 = 68.54%
Formula
Percentage change = [(509 - 302) / 302] x 100
Subtract the new number by the original number
509 - 302 = 207
207 ÷ 302 = 0.6854304635761589
0.6854304635761589 x 100 = 68.54%