57.2% is the change from 521 to 819
Calculation steps:
[( 819 - 521 ) ÷ 521] x 100 = 57.2%
Formula
Percentage change = [(819 - 521) / 521] x 100
Subtract the new number by the original number
819 - 521 = 298
298 ÷ 521 = 0.5719769673704415
0.5719769673704415 x 100 = 57.2%