Ok, I see on second review (unfortunately after I posted), that the second "solution" fails clue #8.
I'm still not convinced that the first solution is unique though, since it was the result of arbitrarily starting with $40 and making some guesses along the way.
Since I'll be starting from scratch, if I decide to continue to disprove that the first solution is unique, I guess I would start the range at $35 (which would move Sam to the second row), to see if another solution seems to be valid, rather than take another shot at the $40 minimum.
p.s. Just ran through a possible $35 minimum scenario, and the first one seems to be a valid solution, and there could be others. I'm thinking this is not a good logic puzzle. Perhaps another pair of eyes can verify I didn't mess up again.
Last edited by passel3; 02-21-2014 at 07:55 AM.
Reason: Did another solution with $35 as the minimum buy