30.66% is the change from 512 to 669
Calculation steps:
[( 669 - 512 ) ÷ 512] x 100 = 30.66%
Formula
Percentage change = [(669 - 512) / 512] x 100
Subtract the new number by the original number
669 - 512 = 157
157 ÷ 512 = 0.306640625
0.306640625 x 100 = 30.66%