Doesn't seem to have a unique answer to me.
Its a 4x6. Since the minimum amount mentioned is $40 and the maximum mentioned is $55, and there is a $5 delta mentioned, there should only be three possible ranges for the costs:
$40, 45, 50, 55, 60, 65
$35, 40, 45, 50, 55, 60
$30, 35, 40, 45, 50, 55
Creating the 4x6 grid and filling in the known fields and relative positions, without knowing the cost range doesn't appear to narrow the cost range choices.
So, arbitrarily choosing to start with the first one, $40 as the minimum, and then working the clues also doesn't seem to result in a unique solution, unless I've made a mistake I can't see.
I only worked through two possibilities, and didn't see any conflict, so would assume there are probably more than two solutions.
I'll post the two I came up with, and see if anyone wants to point out a clue that invalidates one or both solutions.