29.9% is the change from 388 to 504
Calculation steps:
[( 504 - 388 ) ÷ 388] x 100 = 29.9%
Formula
Percentage change = [(504 - 388) / 388] x 100
Subtract the new number by the original number
504 - 388 = 116
116 ÷ 388 = 0.29896907216494845
0.29896907216494845 x 100 = 29.9%