55.47% is the change from 521 to 810
Calculation steps:
[( 810 - 521 ) ÷ 521] x 100 = 55.47%
Formula
Percentage change = [(810 - 521) / 521] x 100
Subtract the new number by the original number
810 - 521 = 289
289 ÷ 521 = 0.5547024952015355
0.5547024952015355 x 100 = 55.47%