71.02% is the change from 521 to 891
Calculation steps:
[( 891 - 521 ) ÷ 521] x 100 = 71.02%
Formula
Percentage change = [(891 - 521) / 521] x 100
Subtract the new number by the original number
891 - 521 = 370
370 ÷ 521 = 0.710172744721689
0.710172744721689 x 100 = 71.02%