3.84% is the change from 521 to 541
Calculation steps:
[( 541 - 521 ) ÷ 521] x 100 = 3.84%
Formula
Percentage change = [(541 - 521) / 521] x 100
Subtract the new number by the original number
541 - 521 = 20
20 ÷ 521 = 0.03838771593090211
0.03838771593090211 x 100 = 3.84%