27.07% is the change from 399 to 507
Calculation steps:
[( 507 - 399 ) ÷ 399] x 100 = 27.07%
Formula
Percentage change = [(507 - 399) / 399] x 100
Subtract the new number by the original number
507 - 399 = 108
108 ÷ 399 = 0.2706766917293233
0.2706766917293233 x 100 = 27.07%