15.51% is the change from 503 to 581
Calculation steps:
[( 581 - 503 ) ÷ 503] x 100 = 15.51%
Formula
Percentage change = [(581 - 503) / 503] x 100
Subtract the new number by the original number
581 - 503 = 78
78 ÷ 503 = 0.1550695825049702
0.1550695825049702 x 100 = 15.51%