54.32% is the change from 521 to 804
Calculation steps:
[( 804 - 521 ) ÷ 521] x 100 = 54.32%
Formula
Percentage change = [(804 - 521) / 521] x 100
Subtract the new number by the original number
804 - 521 = 283
283 ÷ 521 = 0.5431861804222649
0.5431861804222649 x 100 = 54.32%