Bob has a rental property that he rents out to Tara, his student tenant (who is 16 years old) for \\( \\$ 2000 / \\) month. The furnace breaks down in the rental property, and an HVAC technician tells Bob it will cost \\( \\$ 12,000 \\) to replace the old furnace with a brand new one. Tara, who is interning to become an HVAC technician, tells Bob that she's willing to fix the furnace in exchan for free rent. Bob happily agrees to the deal. Bob and Tara do not formally draft up a contract for their agreement because they have always had a good relationship and did not think they would need one. Tara fixes the furnace, and the following exchange happens: Tara: This is great, now I don't have to worry about the rent for 6 months! Bob: Wait, this isn't what I agreed to. Why would you get free rent for 6 months? Tara: Well, it would have cost you \\( \\$ 12,000 \\) to get a new furnace, and my rent is \\( \\$ 2000 \\) a month, so that equates to 6 months... Bob: That's not fair. \\( \\$ 12,000 \\) would have gotten me a bra