28.02% is the change from 521 to 667
Calculation steps:
[( 667 - 521 ) ÷ 521] x 100 = 28.02%
Formula
Percentage change = [(667 - 521) / 521] x 100
Subtract the new number by the original number
667 - 521 = 146
146 ÷ 521 = 0.2802303262955854
0.2802303262955854 x 100 = 28.02%