6.64% is the change from 602 to 642
Calculation steps:
[( 642 - 602 ) ÷ 602] x 100 = 6.64%
Formula
Percentage change = [(642 - 602) / 602] x 100
Subtract the new number by the original number
642 - 602 = 40
40 ÷ 602 = 0.0664451827242525
0.0664451827242525 x 100 = 6.64%