-34.81% is the change from 520 to 339
Calculation steps:
[( 339 - 520 ) ÷ 520] x 100 = -34.81%
Formula
Percentage change = [(339 - 520) / 520] x 100
Subtract the new number by the original number
339 - 520 = -181
-181 ÷ 520 = -0.34807692307692306
-0.34807692307692306 x 100 = -34.81%