6.73% is the change from 520 to 555
Calculation steps:
[( 555 - 520 ) ÷ 520] x 100 = 6.73%
Formula
Percentage change = [(555 - 520) / 520] x 100
Subtract the new number by the original number
555 - 520 = 35
35 ÷ 520 = 0.0673076923076923
0.0673076923076923 x 100 = 6.73%