39.35% is the change from 399 to 556
Calculation steps:
[( 556 - 399 ) ÷ 399] x 100 = 39.35%
Formula
Percentage change = [(556 - 399) / 399] x 100
Subtract the new number by the original number
556 - 399 = 157
157 ÷ 399 = 0.39348370927318294
0.39348370927318294 x 100 = 39.35%