9.22% is the change from 586 to 640
Calculation steps:
[( 640 - 586 ) ÷ 586] x 100 = 9.22%
Formula
Percentage change = [(640 - 586) / 586] x 100
Subtract the new number by the original number
640 - 586 = 54
54 ÷ 586 = 0.09215017064846416
0.09215017064846416 x 100 = 9.22%