Nowhere near the asking price. The point of the question?
The point is to try and see how you perceive value. Note, I did not say the
asking price was £20,000 - if I were selling anything which I believed I would get £20,000 for I would be asking more for it and aiming to accept as much as I could, hopefully more than £20,000, how much it actually goes for either above or below this amount depends on demand and is the "actual" market value.