-66.34% is the change from 505 to 170
Calculation steps:
[( 170 - 505 ) ÷ 505] x 100 = -66.34%
Formula
Percentage change = [(170 - 505) / 505] x 100
Subtract the new number by the original number
170 - 505 = -335
-335 ÷ 505 = -0.6633663366336634
-0.6633663366336634 x 100 = -66.34%