31.55% is the change from 637 to 838
Calculation steps:
[( 838 - 637 ) ÷ 637] x 100 = 31.55%
Formula
Percentage change = [(838 - 637) / 637] x 100
Subtract the new number by the original number
838 - 637 = 201
201 ÷ 637 = 0.315541601255887
0.315541601255887 x 100 = 31.55%