29.07% is the change from 399 to 515
Calculation steps:
[( 515 - 399 ) ÷ 399] x 100 = 29.07%
Formula
Percentage change = [(515 - 399) / 399] x 100
Subtract the new number by the original number
515 - 399 = 116
116 ÷ 399 = 0.2907268170426065
0.2907268170426065 x 100 = 29.07%