38.21% is the change from 390 to 539
Calculation steps:
[( 539 - 390 ) ÷ 390] x 100 = 38.21%
Formula
Percentage change = [(539 - 390) / 390] x 100
Subtract the new number by the original number
539 - 390 = 149
149 ÷ 390 = 0.382051282051282
0.382051282051282 x 100 = 38.21%