6.27% is the change from 399 to 424
Calculation steps:
[( 424 - 399 ) ÷ 399] x 100 = 6.27%
Formula
Percentage change = [(424 - 399) / 399] x 100
Subtract the new number by the original number
424 - 399 = 25
25 ÷ 399 = 0.06265664160401002
0.06265664160401002 x 100 = 6.27%