154.58% is the change from 251 to 639
Calculation steps:
[( 639 - 251 ) ÷ 251] x 100 = 154.58%
Formula
Percentage change = [(639 - 251) / 251] x 100
Subtract the new number by the original number
639 - 251 = 388
388 ÷ 251 = 1.545816733067729
1.545816733067729 x 100 = 154.58%