who designed this table  

label
taken from genuine table, applied to this copy ?

Eero Saarinen
Not sure from your photo but it looks like the tulip table - and the tulip chair and table were designed by Eero Saarinen.
http://www.nps.gov/jeff/ar-eero.htm

Hybrid
It's definitely not a real Knoll saarinen base; nor a real Knoll top.
My guess is (1) either a knock-off top, or a top from a Herman Miller eames aluminum group table (hence label), matched to (2) a knockoff base.

saarinen
but weren't all of his tables mfr'd by knoll, and not miller?
also the base doesn't taper in the same way as the tulip does...

price
so, any idea what a good asking price would be, for my friend to sell this for?
$150-200 ?