laptop Price Check

hi i am looking to sell my laptop in real life idk whats a good asking price is can someone look at the specs and whatever to come up with a fair asking price thanks!

here's list of specs.

specs:
http://prntscr.com/93alcc

preview:
http://prntscr.com/93am2w

also comes with a red dragon 2 side transitioning buttons.
(mouse)


only had it for 4-5 months nothing wrong with it paid $600 for it laptop beats still have box and travel case and everything else.
i am currently asking 400 for it on a app is it fair?.

all opinions welcomed.
please At least Have a good Basic understanding on pricing laptops/desktops.
and if it's worth less please explain why i would love to know thanks! XD

 

Find the retail price, knock 25% off it and then for every year take 5% off. This should give you a basic guideline of the price you could get for it