50.63% is the change from 638 to 961
Calculation steps:
[( 961 - 638 ) ÷ 638] x 100 = 50.63%
Formula
Percentage change = [(961 - 638) / 638] x 100
Subtract the new number by the original number
961 - 638 = 323
323 ÷ 638 = 0.5062695924764891
0.5062695924764891 x 100 = 50.63%