12.09% is the change from 521 to 584
Calculation steps:
[( 584 - 521 ) ÷ 521] x 100 = 12.09%
Formula
Percentage change = [(584 - 521) / 521] x 100
Subtract the new number by the original number
584 - 521 = 63
63 ÷ 521 = 0.12092130518234165
0.12092130518234165 x 100 = 12.09%