31.77% is the change from 639 to 842
Calculation steps:
[( 842 - 639 ) ÷ 639] x 100 = 31.77%
Formula
Percentage change = [(842 - 639) / 639] x 100
Subtract the new number by the original number
842 - 639 = 203
203 ÷ 639 = 0.31768388106416273
0.31768388106416273 x 100 = 31.77%