29.62% is the change from 638 to 827
Calculation steps:
[( 827 - 638 ) ÷ 638] x 100 = 29.62%
Formula
Percentage change = [(827 - 638) / 638] x 100
Subtract the new number by the original number
827 - 638 = 189
189 ÷ 638 = 0.2962382445141066
0.2962382445141066 x 100 = 29.62%