S.O.S. Mathematics CyberBoard

I'm an accounting major and I've done extensive and much more complicated present value problems but for whatever reason this problem from my economics class is leaving me clueless so I was hoping that someone could help me out.

According to the problem: I am thinking of buying land that I can sell in 3 years for $15,000. The asking price is $8000 and my required rate of return is 25%. Based on my present value calculation: 15000/(1.25)^3 = $7680, which is less than the cost, so I should not buy the land.

That's the easy part, but the next part of the question is causing me problems. It says "Suppose instead of $8000, the seller is asking $10000. What is the expected rate of return at this price?" I'm confused first off because in the first part MY required rate of return was 25% but this part seems to be asking for the seller's rate of return. In addition, I don't know how I would solve for that. Does anyone have any ideas?

Rule: if a^x = b, then a = b^(1/x)

10000(1 + r)^3 = 15000
(1 + r)^3 = 15000/10000 = 3/2
1 + r = (3/2)^(1/3)
r = (3/2)^(1/3) - 1 = .14471424.... or ~14.47 %

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Thanks!