54.58% is the change from 251 to 388
Calculation steps:
[( 388 - 251 ) ÷ 251] x 100 = 54.58%
Formula
Percentage change = [(388 - 251) / 251] x 100
Subtract the new number by the original number
388 - 251 = 137
137 ÷ 251 = 0.545816733067729
0.545816733067729 x 100 = 54.58%