53.55% is the change from 521 to 800
Calculation steps:
[( 800 - 521 ) ÷ 521] x 100 = 53.55%
Formula
Percentage change = [(800 - 521) / 521] x 100
Subtract the new number by the original number
800 - 521 = 279
279 ÷ 521 = 0.5355086372360844
0.5355086372360844 x 100 = 53.55%