40.28% is the change from 581 to 815
Calculation steps:
[( 815 - 581 ) ÷ 581] x 100 = 40.28%
Formula
Percentage change = [(815 - 581) / 581] x 100
Subtract the new number by the original number
815 - 581 = 234
234 ÷ 581 = 0.4027538726333907
0.4027538726333907 x 100 = 40.28%