78.5% is the change from 521 to 930
Calculation steps:
[( 930 - 521 ) ÷ 521] x 100 = 78.5%
Formula
Percentage change = [(930 - 521) / 521] x 100
Subtract the new number by the original number
930 - 521 = 409
409 ÷ 521 = 0.7850287907869482
0.7850287907869482 x 100 = 78.5%