-73.08% is the change from 520 to 140
Calculation steps:
[( 140 - 520 ) ÷ 520] x 100 = -73.08%
Formula
Percentage change = [(140 - 520) / 520] x 100
Subtract the new number by the original number
140 - 520 = -380
-380 ÷ 520 = -0.7307692307692307
-0.7307692307692307 x 100 = -73.08%