Except as expressly provided to the contrary in this Agreement, any amounts not paid when due pursuant to this Agreement (and any amounts billed or otherwise invoiced or demanded and properly payable) that are not paid within sixty (60) calendar days of such bill, invoice or other demand shall accrue interest a rate per annum equal to the Prime Rate plus five percent (5%) from but excluding the due date to and including the date of actual payment calculated on a daily basis until such payment is settled.