67.43% is the change from 304 to 509
Calculation steps:
[( 509 - 304 ) ÷ 304] x 100 = 67.43%
Formula
Percentage change = [(509 - 304) / 304] x 100
Subtract the new number by the original number
509 - 304 = 205
205 ÷ 304 = 0.6743421052631579
0.6743421052631579 x 100 = 67.43%