38.39% is the change from 521 to 721
Calculation steps:
[( 721 - 521 ) ÷ 521] x 100 = 38.39%
Formula
Percentage change = [(721 - 521) / 521] x 100
Subtract the new number by the original number
721 - 521 = 200
200 ÷ 521 = 0.3838771593090211
0.3838771593090211 x 100 = 38.39%