30.37% is the change from 642 to 837
Calculation steps:
[( 837 - 642 ) ÷ 642] x 100 = 30.37%
Formula
Percentage change = [(837 - 642) / 642] x 100
Subtract the new number by the original number
837 - 642 = 195
195 ÷ 642 = 0.3037383177570093
0.3037383177570093 x 100 = 30.37%