30.23% is the change from 387 to 504
Calculation steps:
[( 504 - 387 ) ÷ 387] x 100 = 30.23%
Formula
Percentage change = [(504 - 387) / 387] x 100
Subtract the new number by the original number
504 - 387 = 117
117 ÷ 387 = 0.3023255813953488
0.3023255813953488 x 100 = 30.23%