21.03% is the change from 642 to 777
Calculation steps:
[( 777 - 642 ) ÷ 642] x 100 = 21.03%
Formula
Percentage change = [(777 - 642) / 642] x 100
Subtract the new number by the original number
777 - 642 = 135
135 ÷ 642 = 0.2102803738317757
0.2102803738317757 x 100 = 21.03%