15.97% is the change from 501 to 581
Calculation steps:
[( 581 - 501 ) ÷ 501] x 100 = 15.97%
Formula
Percentage change = [(581 - 501) / 501] x 100
Subtract the new number by the original number
581 - 501 = 80
80 ÷ 501 = 0.1596806387225549
0.1596806387225549 x 100 = 15.97%