39.93% is the change from 581 to 813
Calculation steps:
[( 813 - 581 ) ÷ 581] x 100 = 39.93%
Formula
Percentage change = [(813 - 581) / 581] x 100
Subtract the new number by the original number
813 - 581 = 232
232 ÷ 581 = 0.3993115318416523
0.3993115318416523 x 100 = 39.93%