26.64% is the change from 642 to 813
Calculation steps:
[( 813 - 642 ) ÷ 642] x 100 = 26.64%
Formula
Percentage change = [(813 - 642) / 642] x 100
Subtract the new number by the original number
813 - 642 = 171
171 ÷ 642 = 0.26635514018691586
0.26635514018691586 x 100 = 26.64%