-53.85% is the change from 520 to 240
Calculation steps:
[( 240 - 520 ) ÷ 520] x 100 = -53.85%
Formula
Percentage change = [(240 - 520) / 520] x 100
Subtract the new number by the original number
240 - 520 = -280
-280 ÷ 520 = -0.5384615384615384
-0.5384615384615384 x 100 = -53.85%