30.2% is the change from 490 to 638
Calculation steps:
[( 638 - 490 ) ÷ 490] x 100 = 30.2%
Formula
Percentage change = [(638 - 490) / 490] x 100
Subtract the new number by the original number
638 - 490 = 148
148 ÷ 490 = 0.3020408163265306
0.3020408163265306 x 100 = 30.2%