18.95% is the change from 512 to 609
Calculation steps:
[( 609 - 512 ) ÷ 512] x 100 = 18.95%
Formula
Percentage change = [(609 - 512) / 512] x 100
Subtract the new number by the original number
609 - 512 = 97
97 ÷ 512 = 0.189453125
0.189453125 x 100 = 18.95%