-12.5% is the change from 520 to 455
Calculation steps:
[( 455 - 520 ) ÷ 520] x 100 = -12.5%
Formula
Percentage change = [(455 - 520) / 520] x 100
Subtract the new number by the original number
455 - 520 = -65
-65 ÷ 520 = -0.125
-0.125 x 100 = -12.5%