48.9% is the change from 638 to 950
Calculation steps:
[( 950 - 638 ) ÷ 638] x 100 = 48.9%
Formula
Percentage change = [(950 - 638) / 638] x 100
Subtract the new number by the original number
950 - 638 = 312
312 ÷ 638 = 0.4890282131661442
0.4890282131661442 x 100 = 48.9%