24.8% is the change from 512 to 639
Calculation steps:
[( 639 - 512 ) ÷ 512] x 100 = 24.8%
Formula
Percentage change = [(639 - 512) / 512] x 100
Subtract the new number by the original number
639 - 512 = 127
127 ÷ 512 = 0.248046875
0.248046875 x 100 = 24.8%