29.42% is the change from 639 to 827
Calculation steps:
[( 827 - 639 ) ÷ 639] x 100 = 29.42%
Formula
Percentage change = [(827 - 639) / 639] x 100
Subtract the new number by the original number
827 - 639 = 188
188 ÷ 639 = 0.2942097026604069
0.2942097026604069 x 100 = 29.42%