69.1% is the change from 521 to 881
Calculation steps:
[( 881 - 521 ) ÷ 521] x 100 = 69.1%
Formula
Percentage change = [(881 - 521) / 521] x 100
Subtract the new number by the original number
881 - 521 = 360
360 ÷ 521 = 0.690978886756238
0.690978886756238 x 100 = 69.1%