55.17% is the change from 638 to 990
Calculation steps:
[( 990 - 638 ) ÷ 638] x 100 = 55.17%
Formula
Percentage change = [(990 - 638) / 638] x 100
Subtract the new number by the original number
990 - 638 = 352
352 ÷ 638 = 0.5517241379310345
0.5517241379310345 x 100 = 55.17%