3.12% is the change from 642 to 662
Calculation steps:
[( 662 - 642 ) ÷ 642] x 100 = 3.12%
Formula
Percentage change = [(662 - 642) / 642] x 100
Subtract the new number by the original number
662 - 642 = 20
20 ÷ 642 = 0.03115264797507788
0.03115264797507788 x 100 = 3.12%