4.03% is the change from 521 to 542
Calculation steps:
[( 542 - 521 ) ÷ 521] x 100 = 4.03%
Formula
Percentage change = [(542 - 521) / 521] x 100
Subtract the new number by the original number
542 - 521 = 21
21 ÷ 521 = 0.04030710172744722
0.04030710172744722 x 100 = 4.03%