20.7% is the change from 512 to 618
Calculation steps:
[( 618 - 512 ) ÷ 512] x 100 = 20.7%
Formula
Percentage change = [(618 - 512) / 512] x 100
Subtract the new number by the original number
618 - 512 = 106
106 ÷ 512 = 0.20703125
0.20703125 x 100 = 20.7%