20.9% is the change from 512 to 619
Calculation steps:
[( 619 - 512 ) ÷ 512] x 100 = 20.9%
Formula
Percentage change = [(619 - 512) / 512] x 100
Subtract the new number by the original number
619 - 512 = 107
107 ÷ 512 = 0.208984375
0.208984375 x 100 = 20.9%