-70.19% is the change from 520 to 155
Calculation steps:
[( 155 - 520 ) ÷ 520] x 100 = -70.19%
Formula
Percentage change = [(155 - 520) / 520] x 100
Subtract the new number by the original number
155 - 520 = -365
-365 ÷ 520 = -0.7019230769230769
-0.7019230769230769 x 100 = -70.19%