41.78% is the change from 450 to 638
Calculation steps:
[( 638 - 450 ) ÷ 450] x 100 = 41.78%
Formula
Percentage change = [(638 - 450) / 450] x 100
Subtract the new number by the original number
638 - 450 = 188
188 ÷ 450 = 0.4177777777777778
0.4177777777777778 x 100 = 41.78%