56.73% is the change from 520 to 815
Calculation steps:
[( 815 - 520 ) ÷ 520] x 100 = 56.73%
Formula
Percentage change = [(815 - 520) / 520] x 100
Subtract the new number by the original number
815 - 520 = 295
295 ÷ 520 = 0.5673076923076923
0.5673076923076923 x 100 = 56.73%