19.53% is the change from 512 to 612
Calculation steps:
[( 612 - 512 ) ÷ 512] x 100 = 19.53%
Formula
Percentage change = [(612 - 512) / 512] x 100
Subtract the new number by the original number
612 - 512 = 100
100 ÷ 512 = 0.1953125
0.1953125 x 100 = 19.53%