27.32% is the change from 399 to 508
Calculation steps:
[( 508 - 399 ) ÷ 399] x 100 = 27.32%
Formula
Percentage change = [(508 - 399) / 399] x 100
Subtract the new number by the original number
508 - 399 = 109
109 ÷ 399 = 0.2731829573934837
0.2731829573934837 x 100 = 27.32%