-6.73% is the change from 520 to 485
Calculation steps:
[( 485 - 520 ) ÷ 520] x 100 = -6.73%
Formula
Percentage change = [(485 - 520) / 520] x 100
Subtract the new number by the original number
485 - 520 = -35
-35 ÷ 520 = -0.0673076923076923
-0.0673076923076923 x 100 = -6.73%