68.14% is the change from 521 to 876
Calculation steps:
[( 876 - 521 ) ÷ 521] x 100 = 68.14%
Formula
Percentage change = [(876 - 521) / 521] x 100
Subtract the new number by the original number
876 - 521 = 355
355 ÷ 521 = 0.6813819577735125
0.6813819577735125 x 100 = 68.14%