38.6% is the change from 399 to 553
Calculation steps:
[( 553 - 399 ) ÷ 399] x 100 = 38.6%
Formula
Percentage change = [(553 - 399) / 399] x 100
Subtract the new number by the original number
553 - 399 = 154
154 ÷ 399 = 0.38596491228070173
0.38596491228070173 x 100 = 38.6%