66.41% is the change from 521 to 867
Calculation steps:
[( 867 - 521 ) ÷ 521] x 100 = 66.41%
Formula
Percentage change = [(867 - 521) / 521] x 100
Subtract the new number by the original number
867 - 521 = 346
346 ÷ 521 = 0.6641074856046065
0.6641074856046065 x 100 = 66.41%