20.56% is the change from 642 to 774
Calculation steps:
[( 774 - 642 ) ÷ 642] x 100 = 20.56%
Formula
Percentage change = [(774 - 642) / 642] x 100
Subtract the new number by the original number
774 - 642 = 132
132 ÷ 642 = 0.205607476635514
0.205607476635514 x 100 = 20.56%