30.06% is the change from 642 to 835
Calculation steps:
[( 835 - 642 ) ÷ 642] x 100 = 30.06%
Formula
Percentage change = [(835 - 642) / 642] x 100
Subtract the new number by the original number
835 - 642 = 193
193 ÷ 642 = 0.30062305295950154
0.30062305295950154 x 100 = 30.06%