3.85% is the change from 390 to 405
Calculation steps:
[( 405 - 390 ) ÷ 390] x 100 = 3.85%
Formula
Percentage change = [(405 - 390) / 390] x 100
Subtract the new number by the original number
405 - 390 = 15
15 ÷ 390 = 0.038461538461538464
0.038461538461538464 x 100 = 3.85%