10.15% is the change from 581 to 640
Calculation steps:
[( 640 - 581 ) ÷ 581] x 100 = 10.15%
Formula
Percentage change = [(640 - 581) / 581] x 100
Subtract the new number by the original number
640 - 581 = 59
59 ÷ 581 = 0.10154905335628227
0.10154905335628227 x 100 = 10.15%