27.82% is the change from 399 to 510
Calculation steps:
[( 510 - 399 ) ÷ 399] x 100 = 27.82%
Formula
Percentage change = [(510 - 399) / 399] x 100
Subtract the new number by the original number
510 - 399 = 111
111 ÷ 399 = 0.2781954887218045
0.2781954887218045 x 100 = 27.82%