28.9% is the change from 391 to 504
Calculation steps:
[( 504 - 391 ) ÷ 391] x 100 = 28.9%
Formula
Percentage change = [(504 - 391) / 391] x 100
Subtract the new number by the original number
504 - 391 = 113
113 ÷ 391 = 0.289002557544757
0.289002557544757 x 100 = 28.9%