-42.31% is the change from 520 to 300
Calculation steps:
[( 300 - 520 ) ÷ 520] x 100 = -42.31%
Formula
Percentage change = [(300 - 520) / 520] x 100
Subtract the new number by the original number
300 - 520 = -220
-220 ÷ 520 = -0.4230769230769231
-0.4230769230769231 x 100 = -42.31%