-41.35% is the change from 520 to 305
Calculation steps:
[( 305 - 520 ) ÷ 520] x 100 = -41.35%
Formula
Percentage change = [(305 - 520) / 520] x 100
Subtract the new number by the original number
305 - 520 = -215
-215 ÷ 520 = -0.41346153846153844
-0.41346153846153844 x 100 = -41.35%
Example