73.9% is the change from 521 to 906
Calculation steps:
[( 906 - 521 ) ÷ 521] x 100 = 73.9%
Formula
Percentage change = [(906 - 521) / 521] x 100
Subtract the new number by the original number
906 - 521 = 385
385 ÷ 521 = 0.7389635316698656
0.7389635316698656 x 100 = 73.9%