I have the most stupid question -, Regarding spells and "learning" Options

[Tiralee]

WHERE in the 3rd edition Core Rules/Mits does it tell you how much Karma is required to learn a spell?

I'm not talking about design - this is a simple monetary transaction for a certain spell formula that's readily available. (Heal, level 6)

-I've always worked off of 1 Karma for each force of the spell but one of my players has asked me for the actual rule after I tossed him the 3rd Ed Core.

Then the wise-ass suggested that it could be like an active skill (1.5 x desired new level, each time) which resulted in not so subtle suggestions by the magic-using players to shut the frag up before they broke a broomstick off in his ass.
(Magic-users are Karma-holes as it is, for something like that as a rule, god...)

Being anal, I checked but it wasn't where I thought it was and I'm quite stumped. Shall read through more thoroughly later on but a page number would be very useful.

Thank you,

-Tir.