29.28% is the change from 642 to 830
Calculation steps:
[( 830 - 642 ) ÷ 642] x 100 = 29.28%
Formula
Percentage change = [(830 - 642) / 642] x 100
Subtract the new number by the original number
830 - 642 = 188
188 ÷ 642 = 0.29283489096573206
0.29283489096573206 x 100 = 29.28%