49.71% is the change from 521 to 780
Calculation steps:
[( 780 - 521 ) ÷ 521] x 100 = 49.71%
Formula
Percentage change = [(780 - 521) / 521] x 100
Subtract the new number by the original number
780 - 521 = 259
259 ÷ 521 = 0.4971209213051823
0.4971209213051823 x 100 = 49.71%