68.91% is the change from 521 to 880
Calculation steps:
[( 880 - 521 ) ÷ 521] x 100 = 68.91%
Formula
Percentage change = [(880 - 521) / 521] x 100
Subtract the new number by the original number
880 - 521 = 359
359 ÷ 521 = 0.6890595009596929
0.6890595009596929 x 100 = 68.91%