31.73% is the change from 520 to 685
Calculation steps:
[( 685 - 520 ) ÷ 520] x 100 = 31.73%
Formula
Percentage change = [(685 - 520) / 520] x 100
Subtract the new number by the original number
685 - 520 = 165
165 ÷ 520 = 0.3173076923076923
0.3173076923076923 x 100 = 31.73%