84.26% is the change from 521 to 960
Calculation steps:
[( 960 - 521 ) ÷ 521] x 100 = 84.26%
Formula
Percentage change = [(960 - 521) / 521] x 100
Subtract the new number by the original number
960 - 521 = 439
439 ÷ 521 = 0.8426103646833013
0.8426103646833013 x 100 = 84.26%