-67.31% is the change from 520 to 170
Calculation steps:
[( 170 - 520 ) ÷ 520] x 100 = -67.31%
Formula
Percentage change = [(170 - 520) / 520] x 100
Subtract the new number by the original number
170 - 520 = -350
-350 ÷ 520 = -0.6730769230769231
-0.6730769230769231 x 100 = -67.31%