17.27% is the change from 521 to 611
Calculation steps:
[( 611 - 521 ) ÷ 521] x 100 = 17.27%
Formula
Percentage change = [(611 - 521) / 521] x 100
Subtract the new number by the original number
611 - 521 = 90
90 ÷ 521 = 0.1727447216890595
0.1727447216890595 x 100 = 17.27%