10.03% is the change from 399 to 439
Calculation steps:
[( 439 - 399 ) ÷ 399] x 100 = 10.03%
Formula
Percentage change = [(439 - 399) / 399] x 100
Subtract the new number by the original number
439 - 399 = 40
40 ÷ 399 = 0.10025062656641603
0.10025062656641603 x 100 = 10.03%