29.23% is the change from 390 to 504
Calculation steps:
[( 504 - 390 ) ÷ 390] x 100 = 29.23%
Formula
Percentage change = [(504 - 390) / 390] x 100
Subtract the new number by the original number
504 - 390 = 114
114 ÷ 390 = 0.2923076923076923
0.2923076923076923 x 100 = 29.23%