24.85% is the change from 511 to 638
Calculation steps:
[( 638 - 511 ) ÷ 511] x 100 = 24.85%
Formula
Percentage change = [(638 - 511) / 511] x 100
Subtract the new number by the original number
638 - 511 = 127
127 ÷ 511 = 0.24853228962818003
0.24853228962818003 x 100 = 24.85%