25.2% is the change from 512 to 641
Calculation steps:
[( 641 - 512 ) ÷ 512] x 100 = 25.2%
Formula
Percentage change = [(641 - 512) / 512] x 100
Subtract the new number by the original number
641 - 512 = 129
129 ÷ 512 = 0.251953125
0.251953125 x 100 = 25.2%