-24.81% is the change from 665 to 500
Calculation steps:
[( 500 - 665 ) ÷ 665] x 100 = -24.81%
Formula
Percentage change = [(500 - 665) / 665] x 100
Subtract the new number by the original number
500 - 665 = -165
-165 ÷ 665 = -0.24812030075187969
-0.24812030075187969 x 100 = -24.81%