55.58% is the change from 520 to 809
Calculation steps:
[( 809 - 520 ) ÷ 520] x 100 = 55.58%
Formula
Percentage change = [(809 - 520) / 520] x 100
Subtract the new number by the original number
809 - 520 = 289
289 ÷ 520 = 0.5557692307692308
0.5557692307692308 x 100 = 55.58%