15.74% is the change from 521 to 603
Calculation steps:
[( 603 - 521 ) ÷ 521] x 100 = 15.74%
Formula
Percentage change = [(603 - 521) / 521] x 100
Subtract the new number by the original number
603 - 521 = 82
82 ÷ 521 = 0.15738963531669867
0.15738963531669867 x 100 = 15.74%