13.77% is the change from 581 to 661
Calculation steps:
[( 661 - 581 ) ÷ 581] x 100 = 13.77%
Formula
Percentage change = [(661 - 581) / 581] x 100
Subtract the new number by the original number
661 - 581 = 80
80 ÷ 581 = 0.13769363166953527
0.13769363166953527 x 100 = 13.77%