Let's say you've got an item that's 10.00 for a one day rental, and for a three day rental it's 9.50/ day, for a week rental it's 9.00/ day, and for a monthly rental it's 8.50/day.

The way we'd set this up in the item is to set the three day price as 28.50, weekly as 63.00, and monthly as 260.00 (I rounded this up for months that are 28, 30, or 31 days long)
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I need to set it up this way because the system will always look for the best deal for the client. If I put the three day price as 9.50, then for even a one day rental, the client would be charged the lower, three day rate!