63.59% is the change from 390 to 638
Calculation steps:
[( 638 - 390 ) ÷ 390] x 100 = 63.59%
Formula
Percentage change = [(638 - 390) / 390] x 100
Subtract the new number by the original number
638 - 390 = 248
248 ÷ 390 = 0.6358974358974359
0.6358974358974359 x 100 = 63.59%