28.79% is the change from 521 to 671
Calculation steps:
[( 671 - 521 ) ÷ 521] x 100 = 28.79%
Formula
Percentage change = [(671 - 521) / 521] x 100
Subtract the new number by the original number
671 - 521 = 150
150 ÷ 521 = 0.28790786948176583
0.28790786948176583 x 100 = 28.79%