-17.31% is the change from 520 to 430
Calculation steps:
[( 430 - 520 ) ÷ 520] x 100 = -17.31%
Formula
Percentage change = [(430 - 520) / 520] x 100
Subtract the new number by the original number
430 - 520 = -90
-90 ÷ 520 = -0.17307692307692307
-0.17307692307692307 x 100 = -17.31%