21.65% is the change from 642 to 781
Calculation steps:
[( 781 - 642 ) ÷ 642] x 100 = 21.65%
Formula
Percentage change = [(781 - 642) / 642] x 100
Subtract the new number by the original number
781 - 642 = 139
139 ÷ 642 = 0.21651090342679127
0.21651090342679127 x 100 = 21.65%