74.47% is the change from 521 to 909
Calculation steps:
[( 909 - 521 ) ÷ 521] x 100 = 74.47%
Formula
Percentage change = [(909 - 521) / 521] x 100
Subtract the new number by the original number
909 - 521 = 388
388 ÷ 521 = 0.744721689059501
0.744721689059501 x 100 = 74.47%