39.66% is the change from 638 to 891
Calculation steps:
[( 891 - 638 ) ÷ 638] x 100 = 39.66%
Formula
Percentage change = [(891 - 638) / 638] x 100
Subtract the new number by the original number
891 - 638 = 253
253 ÷ 638 = 0.39655172413793105
0.39655172413793105 x 100 = 39.66%