34.42% is the change from 642 to 863
Calculation steps:
[( 863 - 642 ) ÷ 642] x 100 = 34.42%
Formula
Percentage change = [(863 - 642) / 642] x 100
Subtract the new number by the original number
863 - 642 = 221
221 ÷ 642 = 0.3442367601246106
0.3442367601246106 x 100 = 34.42%