51.18% is the change from 422 to 638
Calculation steps:
[( 638 - 422 ) ÷ 422] x 100 = 51.18%
Formula
Percentage change = [(638 - 422) / 422] x 100
Subtract the new number by the original number
638 - 422 = 216
216 ÷ 422 = 0.5118483412322274
0.5118483412322274 x 100 = 51.18%